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{{short description|Regulation of the consumption of food}} | |||
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{{Human body weight}} | |||
'''Dieting''' is the practice of ] food in a regulated way to decrease, maintain, or increase ], or to prevent and treat diseases such as ] and ]. As weight loss depends on ] intake, ] of ] diets, such as those emphasising particular macronutrients (], ], etc.), have been shown to be no more effective than one another.<ref name=Strychar>{{cite journal | vauthors = Strychar I | title = Diet in the management of weight loss | journal = CMAJ | volume = 174 | issue = 1 | pages = 56–63 | date = January 2006 | pmid = 16389240 | pmc = 1319349 | doi = 10.1503/cmaj.045037 }}</ref><ref name="Thom2017">{{cite journal | vauthors = Thom G, Lean M | title = Is There an Optimal Diet for Weight Management and Metabolic Health? | journal = Gastroenterology | volume = 152 | issue = 7 | pages = 1739–1751 | date = May 2017 | pmid = 28214525 | doi = 10.1053/j.gastro.2017.01.056 | url = http://eprints.gla.ac.uk/137779/7/137779.pdf | type = Review | access-date = 24 November 2019 | archive-date = 19 July 2018 | archive-url = https://web.archive.org/web/20180719104604/http://eprints.gla.ac.uk/137779/7/137779.pdf | url-status = live }}</ref><ref name="JAMA Dieting Patient Page">{{cite journal | vauthors = Guth E | title = JAMA patient page. Healthy weight loss | journal = JAMA | volume = 312 | issue = 9 | pages = 974 | date = September 2014 | pmid = 25182116 | doi = 10.1001/jama.2014.10929 | doi-access = free }}</ref><ref name = sacks>{{cite journal | vauthors = Sacks FM, Bray GA, Carey VJ, Smith SR, Ryan DH, Anton SD, McManus K, Champagne CM, Bishop LM, Laranjo N, Leboff MS, Rood JC, de Jonge L, Greenway FL, Loria CM, Obarzanek E, Williamson DA | display-authors = 6 | title = Comparison of weight-loss diets with different compositions of fat, protein, and carbohydrates | journal = The New England Journal of Medicine | volume = 360 | issue = 9 | pages = 859–873 | date = February 2009 | pmid = 19246357 | pmc = 2763382 | doi = 10.1056/NEJMoa0804748 }}</ref><ref name="Wadden2012" /> As weight regain is common, diet success is best predicted by long-term adherence.<ref name="Thom2017" /><ref name="Wadden2012" /><ref name="Anderson 579–584">{{cite journal | vauthors = Anderson JW, Konz EC, Frederich RC, Wood CL | title = Long-term weight-loss maintenance: a meta-analysis of US studies | journal = The American Journal of Clinical Nutrition | volume = 74 | issue = 5 | pages = 579–584 | date = November 2001 | pmid = 11684524 | doi = 10.1093/ajcn/74.5.579 | doi-access = free }}</ref> Regardless, the outcome of a diet can vary widely depending on the individual.<ref name="Thom2017" /><ref name="Mann2007"/> | |||
The first popular diet was "Banting", named after ]. In his 1863 pamphlet, '']'', he outlined the details of a particular low-carbohydrate, low-calorie diet that led to his own dramatic weight loss.<ref name="Jennifer Petrelli; Kathleen Y. Wolin 2009 11">{{cite book | vauthors = Petrelli J, Wolin KY |title=Obesity (Biographies of Disease) |publisher=Greenwood |location=Westport, Conn |year=2009 |pages=11 |isbn=978-0-313-35275-1}}</ref> | |||
'''Dieting''' is the practice of ] (and ]) in a regulated fashion to achieve a particular, short term objective. This is distinct from the more basic concept of "diet," which addresses the longer term and more generic habit of nutritional consumption. For example, a purist vegan eats a diet completely devoid of animal products, including milk; but while this is a diet, it is not "''dieting''." | |||
Some guidelines recommend dieting to ] for people with weight-related health problems, but not for otherwise healthy people.<ref name="harrington2">{{cite journal | vauthors = Harrington M, Gibson S, Cottrell RC | title = A review and meta-analysis of the effect of weight loss on all-cause mortality risk | journal = Nutrition Research Reviews | volume = 22 | issue = 1 | pages = 93–108 | date = June 2009 | pmid = 19555520 | doi = 10.1017/S0954422409990035 | doi-access = free }}</ref><ref name="USGuidelines2013">{{cite journal | vauthors = Jensen MD, Ryan DH, Apovian CM, Ard JD, Comuzzie AG, Donato KA, Hu FB, Hubbard VS, Jakicic JM, Kushner RF, Loria CM, Millen BE, Nonas CA, Pi-Sunyer FX, Stevens J, Stevens VJ, Wadden TA, Wolfe BM, Yanovski SZ, Jordan HS, Kendall KA, Lux LJ, Mentor-Marcel R, Morgan LC, Trisolini MG, Wnek J, Anderson JL, Halperin JL, Albert NM, Bozkurt B, Brindis RG, Curtis LH, DeMets D, Hochman JS, Kovacs RJ, Ohman EM, Pressler SJ, Sellke FW, Shen WK, Smith SC, Tomaselli GF | display-authors = 6 | title = 2013 AHA/ACC/TOS guideline for the management of overweight and obesity in adults: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines and The Obesity Society | journal = Circulation | volume = 129 | issue = 25 Suppl 2 | pages = S102–S138 | date = June 2014 | pmid = 24222017 | pmc = 5819889 | doi = 10.1161/01.cir.0000437739.71477.ee | type = Professional society guideline }}</ref> One survey found that almost half of all American adults attempt to lose weight through dieting, including 66.7% of obese adults and 26.5% of normal weight or underweight adults.<ref>{{Cite web|date=2019-06-07|title=Products - Data Briefs - Number 313 - July 2018|url=https://www.cdc.gov/nchs/products/databriefs/db313.htm|access-date=2020-12-25|website=www.cdc.gov|language=en-us|archive-date=12 December 2020|archive-url=https://web.archive.org/web/20201212001742/https://www.cdc.gov/nchs/products/databriefs/db313.htm|url-status=live}}</ref> Dieters who are ] (but not obese), who are normal weight, or who are ] may have an increased mortality rate as a result of dieting.<ref name="harrington2"/> | |||
The most common objective of dieting is loss of excess body fat. There are also special religious diets - observant Jews, for example, must not eat certain foods during Passover when special dietary rules are in effect; and other religious-based dietary restrictions apply throughout the year to Jews, Muslims, and Hindus, among others. Some diets are prescribed for particular medical reasons, such as sodium-free diets, bland diets and soft food diets. Some dieting is actually designed to promote increase of body fat and/or of muscular weight gain. | |||
==Types of Diets== | |||
There are several kinds of diets: | |||
*Weight-loss diets restrict the intake of specific foods, or food in general, or reduce body weight. This is what "fad diets" are marketed for. There is a (sometimes confusing) multitude of weight loss techniques, many of which are ineffective. What works for one person will not necessarily work for another, due to metabolic differences and lifestyle factors. | |||
*Certain religions (such as ], ] and ]) impose strict restrictions on food choices and preparation, in accordance with edict and tradition. | |||
*] is typically adopted in pursuit of general good health, for spiritual or ethical reasons, when other food choices are not available, or as a matter of personal taste. | |||
*] and ] are psychological (and possibly neurological) disorders in which victims endanger their lives through dangerous diet patterns. | |||
*Many professional athletes impose weight-gain diets on themselves. For example, ]s may overeat in order to achieve a higher weight class. Football players may try to "bulk up" through weight-gain diets in order to gain an advantage on the field with a higher mass. | |||
*Medical conditions often require the following of special ]. Each of these such diets will specifically include or exclude or regulate certain chemicals (and the foods that contain them). For example, a person who has ] is often on a diet designed to carefully manage their ] level. Sufferers of ] must follow a ]-free diet, the ] are advised to omit ] products, and people with ] must follow a strict low-] diet to ease the strain on their kidneys. Treatment of mild ] includes adhering to a diet rich in ] and ] and low in fat and sodium. This diet may be tailored to focus on weight loss if that is necessary to control ]. | |||
==History== | ==History== | ||
] popularized one of the first weight loss diets in the 19th century.]] | |||
The practice of dieting in order to lose weight is ancient in its origins. Throughout the 17th and 18th centuries, physicians and patients regulated their food carefully, in order to prevent disease. In the 19th century, as the scientific classification of foods took shape, doctors and scientists began experimenting with targeted diets. | |||
The word ''diet'' comes from the Greek '']'', which represents a notion of a whole way healthy lifestyle including both mental and physical health, rather than a narrow weight-loss regimen.<ref name="Foxcroft2012">{{cite book |vauthors=Foxcroft L |title=Calories & corsets : a history of dieting over 2,000 years |date=2014 |publisher=Profile Books |isbn=978-1847654588 |url=https://books.google.com/books?id=ih5qnNit-KIC |access-date=6 June 2020 |archive-date=14 January 2023 |archive-url=https://web.archive.org/web/20230114192810/https://books.google.com/books?id=ih5qnNit-KIC |url-status=live }}</ref><ref>{{cite news | url=https://www.bbc.com/news/magazine-20695743 | title=History's weirdest fad diets | work=BBC News | date=2 January 2013 | access-date=24 October 2019 | archive-date=30 June 2022 | archive-url=https://web.archive.org/web/20220630112051/https://www.bbc.com/news/magazine-20695743 | url-status=live }}</ref> | |||
One of the first ]s was the English doctor ]. He himself was tremendously overweight and would constantly eat large quantities of rich food and drink. He began a meatless diet, taking only milk and vegetables, and soon regained his health. He began publicly recommending his diet for everyone who was obese. In 1724, he wrote ''An Essay of Health and Long Life'', in which he advises exercise and fresh air and avoiding luxury foods.<ref>{{Cite web|url=http://www.ivu.org/history/williams/cheyne.html|title=The Ethics of Diet - A Catena|access-date=17 December 2012|archive-date=20 August 2021|archive-url=https://web.archive.org/web/20210820151827/http://www.ivu.org/history/williams/cheyne.html|url-status=live}}</ref> | |||
] is one of the first people known to have successfully lost weight by dieting, circa ], by targeting carbohydrates. The ], sometimes marketed today as the ] Diet, remains popular today. | |||
The Scottish military surgeon, ], published ''Notes of a Diabetic Case'' in 1797. It described the benefits of a meat diet for those with ], basing this recommendation on ]'s discovery of ] in ].<ref>{{cite book| vauthors = Joslin EP |title=Joslin's Diabetes Mellitus: Edited by C. Ronald Kahn ... .|url=https://books.google.com/books?id=ohgjG0qAvfgC&pg=PA3|access-date=20 June 2013|year=2005|publisher=Lippincott Williams & Wilkins|isbn=978-0-7817-2796-9|page=3}}</ref> By means of Dobson's testing procedure (for ] in the urine) Rollo worked out a diet that had success for what is now called ].<ref>{{cite book| vauthors = Chalem LD |title=Essential Diabetes Leadership|url=https://books.google.com/books?id=I-5BIoIJT5YC&pg=PA39|access-date=20 June 2013|date=5 September 2009|publisher=Laurence Chalem|isbn=978-1-4392-4566-8|page=39}}</ref> | |||
==Scientific principles of weight loss== | |||
A successful weight-loss diet requires that energy expenditure exceeds energy intake (from food). One must burn 14,500 kilojoules (3,500 Calories) more than one consumes to lose one pound (0.45 kilograms) or burn 37,000 kilojoules (9000 Calories) more than one consumes to lose one kilogram. | |||
The first popular diet was "Banting", named after the English ] ]. In 1863, he wrote a booklet called ''Letter on Corpulence, Addressed to the Public'', which contained the particular plan for the diet he had successfully followed. His own diet was four meals per day, consisting of meat, greens, fruits, and dry wine. The emphasis was on avoiding sugar, sweet foods, starch, beer, milk and butter. Banting's pamphlet was popular for years to come, and would be used as a model for modern diets.<ref name=Britannica>{{cite EB1911 | |||
===Thermoregulation=== | |||
| wstitle = Corpulence | |||
According to the principles of ], humans are ]. We expend energy to maintain our blood temperature at ], which is about 37 °C (98.6 °F). This is accomplished by metabolism and blood circulation, by shivering to stay warm, and by sweating to stay cool. | |||
| volume = 7 | |||
| pages = 192–193 | |||
}}</ref> The pamphlet's popularity was such that the question "Do you bant?" referred to his method, and eventually to dieting in general.<ref name=Groves>{{Cite web | url = http://www.second-opinions.co.uk/banting.html | title = WILLIAM BANTING: The Father of the Low-Carbohydrate Diet | access-date = 26 December 2007 | vauthors = Groves B | year = 2002 | publisher = Second Opinions | archive-date = 11 June 2011 | archive-url = https://web.archive.org/web/20110611192236/http://www.second-opinions.co.uk/banting.html | url-status = live }}</ref> His booklet remains in print as of 2007.<ref name="Jennifer Petrelli; Kathleen Y. Wolin 2009 11"/><ref name=Cosimo>{{Cite book| vauthors = Banting W |title=Letter on Corpulence|orig-year=1863|url=http://www.cosimobooks.com/bookstore_a/book_description.php?book=83|access-date=28 December 2007|year=2005|publisher=Cosimo Classics|location=USA: New York|isbn=978-1-59605-085-3|pages=64 pages|archive-url=https://web.archive.org/web/20110708193412/http://www.cosimobooks.com/bookstore_a/book_description.php?book=83|archive-date=8 July 2011|url-status=dead}}</ref> | |||
The first weight-loss book to promote calorie counting, and the first weight-loss book to become a bestseller, was the 1918 '']'' by American physician and columnist ].<ref>{{cite book| vauthors = Kawash S |title = Candy: A Century of Panic and Pleasure|date = 2013|publisher = Faber & Faber, Incorporated|location = New York|isbn = 978-0-86547-756-8 |pages = 185–189}}</ref> | |||
In addition to thermoregulation, humans expend energy keeping the vital organs (especially the lungs, heart and brain) functioning. Except when sleeping, our ] are working, typically to maintain upright ]. The average work done just to stay alive is the ], which (for humans) is about 1 watt per kilogram of body mass. Thus, an average man of 75 kilograms who just rests (or only walks a few steps) burns about 75 watts (continuously), or about 6,500 ] (1,500 ]) per day. | |||
It was estimated that over 1000 weight-loss diets have been developed up to 2014.<ref name="Matarese2014" /> | |||
===Physical exercise (with an example)=== | |||
] is an important complement to dieting in securing weight loss. ] is also an important part of maintaining normal ], especially the ] of the heart. To be useful, aerobic exercise requires maintaining a ] of above 50 percent of one's ] for 30 minutes, at least 3 times a week. Brisk walking can accomplish this. | |||
==Types == | |||
The ability of a few hours a week of exercise to contribute to weight loss can be overestimated. To illustrate, consider a 100-kilogram man who wants to lose 10 kilograms and assume that he eats just enough to maintain his weight (at rest), so that weight loss can only come from exercise. Those 10 kilograms converted to work are equivalent to about 350 megajoules. (We use an approximation of the standard 37 kilojoules or 9 Calories per gram of fat.) Now assume that his chosen exercise is stairclimbing and that he is 20 percent efficient at converting chemical energy into mechanical work (this is within measured ranges). To lose the weight, he must ascend 70 kilometers. A man of normal fitness (like him) will be tired after 500 meters of climbing (about 150 flights of stairs), so he needs to exercise every day for 140 days (to reach his target). | |||
{{main|List of diets}} | |||
A restricted ] is most commonly pursued by those who want to ]. Some people follow a diet to gain weight (such as people who are underweight or who are attempting to gain more ]). Diets can also be used to maintain a stable body weight or to improve health.<ref name=":1">{{cite journal | vauthors = Freire R | title = Scientific evidence of diets for weight loss: Different macronutrient composition, intermittent fasting, and popular diets | journal = Nutrition | volume = 69 | pages = 110549 | date = January 2020 | pmid = 31525701 | doi = 10.1016/j.nut.2019.07.001 | s2cid = 198280773 }}</ref> | |||
===Low-fat=== | |||
The minimum safe dietary energy intake (without medical supervision) is 75 percent of that needed to maintain basal metabolism. For our hypothetical 100-kilogram man, that minimum is about 5,700 kilojoules (1,300 Calories) per day. By combining daily aerobic exercise with a weight-loss diet, he would be able to lose 10 kilograms in half the time (70 days). Of course, the described regime is more rigorous than would be desirable or advisable for many persons. Therefore, under an effective but more manageable weight-loss program, losing 10 kilograms (about 20 pounds) may take as long as 6 months. | |||
{{Main|Low-fat diet}} | |||
Low-fat diets involve the reduction of the percentage of fat in one's diet. Calorie consumption is reduced because less fat is consumed.<ref>{{Cite journal |last1=Sandrou |first1=D. K. |last2=Arvanitoyannis |first2=I. S. |date=2000 |title=Low-Fat/Calorie Foods: Current State and Perspectives |url=http://www.tandfonline.com/doi/abs/10.1080/10408690091189211 |journal=Critical Reviews in Food Science and Nutrition |language=en |volume=40 |issue=5 |pages=427–447 |doi=10.1080/10408690091189211 |pmid=11029012 |s2cid=25469380 |issn=1040-8398 |access-date=14 August 2022 |archive-date=15 June 2022 |archive-url=https://web.archive.org/web/20220615152947/https://www.tandfonline.com/doi/abs/10.1080/10408690091189211 |url-status=live }}</ref> Diets of this type include NCEP Step I and II. A meta-analysis of 16 trials of 2–12 months' duration found that low-fat diets (without intentional restriction of caloric intake) resulted in average weight loss of {{convert|3.2|kg|lb|abbr=on}} over habitual eating.<ref name=Strychar/> | |||
A low-fat, plant-based diet has been found to improve control of weight, ]s, and ].<ref>{{cite journal | vauthors = Trapp CB, Barnard ND | title = Usefulness of vegetarian and vegan diets for treating type 2 diabetes | journal = Current Diabetes Reports | volume = 10 | issue = 2 | pages = 152–158 | date = April 2010 | pmid = 20425575 | doi = 10.1007/s11892-010-0093-7 | s2cid = 13151225 }}</ref> | |||
===Fat loss versus muscle loss (and the importance of exercise and protein intake)=== | |||
It is important to understand the difference between weight loss and fat loss. Weight loss typically involves the loss of fat, water and muscle. A dieter can lose weight without losing much fat. Ideally, overweight people should seek to lose fat and preserve muscle, since muscle burns more calories than fat. Generally, the more muscle mass one has, the higher one's metabolism is, resulting in more calories being burned, even at rest. Since muscles are denser, muscle loss results in little loss of physical bulk compared with fat loss. To determine whether weight loss is due to fat, various methods of measuring ] have been developed. | |||
===Low-carbohydrate=== | |||
Muscle loss during weight loss can be restricted by regularly lifting weights (or doing ] and other strength-oriented ]) and by maintaining sufficient ] intake. According to the ], the ] for protein is "0.8 grams per kilogram of body weight for adults." | |||
{{Excerpt|Low-carbohydrate diet|paragraphs=1-4}} | |||
===Low-calorie=== | |||
Those on low-carbohydrate diets, and those doing particularly strenuous exercise, may wish to increase their protein intake. Excessive protein intake. According to the ] for ]. | |||
{{Main|Calorie restriction}} | |||
Low-calorie diets usually produce an energy deficit of 500–1,000 calories per day, which can result in a {{convert|0.5|to|1|kg|lb|abbr=off}} weight loss per week.<ref>{{Cite journal |last1=Finkler |first1=Elissa |last2=Heymsfield |first2=Steven B. |last3=St-Onge |first3=Marie-Pierre |date=January 2012 |title=Rate of weight loss can be predicted by patient characteristics and intervention strategies |journal=Journal of the Academy of Nutrition and Dietetics |volume=112 |issue=1 |pages=75–80 |doi=10.1016/j.jada.2011.08.034 |issn=2212-2672 |pmc=3447534 |pmid=22717178}}</ref> The National Institutes of Health reviewed 34 ]s to determine the effectiveness of low-calorie diets. They found that these diets lowered total body mass by 8% in the short term, over 3–12 months.<ref name=Strychar/> Women doing low-calorie diets should have at least 1,000 calories per day and men should have approximately 1,200 calories per day. These caloric intake values vary depending on additional factors, such as age and weight.<ref name="Strychar" /> | |||
===Very low-calorie=== | |||
===Actual energy obtained from food=== | |||
{{Main|Very low calorie diet}} | |||
Very low calorie diets provide 200–800 calories per day, maintaining protein intake but limiting calories from both fat and carbohydrates.<ref>{{Cite journal |last1=Fock |first1=Kwong Ming |last2=Khoo |first2=Joan |date=2013 |title=Diet and exercise in management of obesity and overweight: Diet and exercise for weight management |journal=Journal of Gastroenterology and Hepatology |language=en |volume=28 |pages=59–63 |doi=10.1111/jgh.12407|pmid=24251706 |s2cid=28818676 |doi-access=free }}</ref> They subject the body to ] and produce an average loss of {{convert|1.5|–|2.5|kg|lb|abbr=on}} per week.{{Citation needed|date=December 2021}} "2-4-6-8", a popular diet of this variety, follows a four-day cycle in which only 200 calories are consumed the first day, 400 the second day, 600 the third day, 800 the fourth day, and then totally ], after which the cycle repeats.{{Citation needed|date=December 2021}} There is some evidence that these diets results in considerable weight loss.<ref name="Thom2017" /> These diets are not recommended for general use and should be reserved for the ] as they are associated with ]s such as loss of lean muscle mass, increased risks of ], and ]s. People attempting these diets must be monitored closely by a physician to prevent complications.<ref name=Strychar/> | |||
The concept of crash dieting is to drastically reduce calories, using a very-low-calorie diet.<ref>{{cite web |title=How to diet |url=https://www.nhs.uk/live-well/healthy-weight/how-to-diet/ |website=nhs.uk |language=en |date=27 April 2018 |access-date=17 October 2019 |archive-date=22 November 2017 |archive-url=https://web.archive.org/web/20171122105610/https://www.nhs.uk/livewell/loseweight/Pages/how-to-diet.aspx |url-status=live }}</ref><ref>{{cite web |title=Take the test: Is an 800-calorie diet right for me? |url=https://www.bbc.co.uk/food/articles/crash_diet_test |website=BBC Food |language=en |access-date=19 October 2019 |archive-date=18 June 2022 |archive-url=https://web.archive.org/web/20220618145752/https://www.bbc.co.uk/food/articles/crash_diet_test |url-status=live }}</ref><ref>{{cite web |last1=Bonet |first1=Anna |title=Are crash diets ever a good idea for weight loss? |url=https://www.netdoctor.co.uk/healthy-eating/a25288668/are-crash-diets-bad-for-you/ |website=Netdoctor |date=28 November 2018 |quote='A crash diet is typically a very low-calorie diet, where you eat a very restrictively for a short period of time,' explains Registered Dietician, Helen Bond. |access-date=19 October 2019 |archive-date=7 July 2022 |archive-url=https://web.archive.org/web/20220707010239/https://www.netdoctor.co.uk/healthy-eating/a25288668/are-crash-diets-bad-for-you/ |url-status=live }}</ref><ref>{{cite web |title=Crash diets can cause transient deterioration in heart function |url=https://www.sciencedaily.com/releases/2018/02/180202123836.htm |website=ScienceDaily |language=en |date=2018-02-02 |access-date=17 August 2019 |archive-date=29 April 2022 |archive-url=https://web.archive.org/web/20220429184602/https://www.sciencedaily.com/releases/2018/02/180202123836.htm |url-status=live }}</ref> Crash dieting can be highly dangerous because it can cause various kind of issues for the human body. Crash dieting can produce weight loss but without professional supervision all along, the extreme reduction in calories and potential unbalance in the diet's composition can lead to detrimental effects, including sudden death.<ref>{{cite web |title=How crash diets harm your health - CNN.com |url=http://edition.cnn.com/2010/HEALTH/04/20/crash.diets.harm.health/index.html |website=www.cnn.com |language=en |access-date=17 August 2019 |archive-date=19 May 2022 |archive-url=https://web.archive.org/web/20220519105134/http://edition.cnn.com/2010/HEALTH/04/20/crash.diets.harm.health/index.html |url-status=live }}</ref> | |||
The energy humans get from food is limited by the efficiency of digestion and the efficiency of utilization. The efficiency of digestion is largely dependent on the type of food being eaten. Poorly chewed seeds are poorly digested. Refined sugars and fats are absorbed almost completely. Despite the claims of certain popular diets, chewing and digesting does not use a substantial amount of the energy offered by any food (that anyone would want to eat). Even celery, known for being low in caloric value, contains enough ] (including ], ] and ]) to easily compensate for the cost of (energy invested in) chewing it. (See .} | |||
===Fasting=== | |||
The efficiency of energy utilization by skeletal muscles is around 20 percent. That is, of the chemical energy used, 20 percent does work and 80 percent creates heat. | |||
{{Main|Fasting|Intermittent fasting}} | |||
Fasting is the act of intentional taking a long time interval between meals. Lengthy fasting (multiple days in a week) might be dangerous due to the risk of ].<ref>{{cite journal | vauthors = Horne BD, Muhlestein JB, Anderson JL | title = Health effects of intermittent fasting: hormesis or harm? A systematic review | journal = The American Journal of Clinical Nutrition | volume = 102 | issue = 2 | pages = 464–470 | date = August 2015 | pmid = 26135345 | doi = 10.3945/ajcn.115.109553 | doi-access = free }}</ref> During prolonged fasting or very low calorie diets the reduction of blood glucose, the preferred energy source of the ], causes the body to deplete its glycogen stores.<ref name=":1" /> Once glycogen is depleted the body begins to fuel the brain using ketones, while also metabolizing body protein (including but not limited to skeletal muscle) to be used to synthesize sugars for use as energy by the rest of the body.<ref name=":1" /> Most experts believe that a prolonged fast can lead to muscle wasting,<ref>{{Cite web |date=2021-06-30 |title=Intermittent Fasting Can Lead to Muscle Loss, But It Doesn't Have to – Here's Why |url=https://newjersey.jeffersonhealth.org/content/intermittent-fasting-can-lead-muscle-loss-it-doesn%E2%80%99t-have-%E2%80%93-here%E2%80%99s-why |access-date=2022-11-10 |website=Jefferson Health New Jersey |archive-date=10 November 2022 |archive-url=https://web.archive.org/web/20221110083145/https://newjersey.jeffersonhealth.org/content/intermittent-fasting-can-lead-muscle-loss-it-doesn%E2%80%99t-have-%E2%80%93-here%E2%80%99s-why |url-status=live }}</ref> although some{{who|date=April 2022}} dispute this.{{citation needed|date=April 2022}} The use of short-term fasting, or various forms of ], have been used as a form of dieting to circumvent the issues of long fasting.<ref>{{Cite journal |last1=Horne |first1=Benjamin D |last2=Muhlestein |first2=Joseph B |last3=Anderson |first3=Jeffrey L |date=2015-08-01 |title=Health effects of intermittent fasting: hormesis or harm? A systematic review |journal=The American Journal of Clinical Nutrition |language=en |volume=102 |issue=2 |pages=464–470 |doi=10.3945/ajcn.115.109553 |pmid=26135345 |s2cid=1478175 |issn=0002-9165|doi-access=free }}</ref> | |||
Intermittent fasting commonly takes the form of periodic fasting, alternate-day fasting, time-restricted feeding, and/or religious fasting.<ref name=":1" /> It can be a form of reduced-calorie dieting but pertains entirely to when the metabolism is activated during the day for digestion. The changes to eating habits on a regular basis do not have to be severe or absolutely restrictive to see benefits to cardiovascular health, such as improved glucose metabolism, reduced inflammation, and reduced blood pressure.<ref>{{Cite journal |last1=Becker |first1=Amanda |last2=Gaballa |first2=Dianna |last3=Roslin |first3=Mitchell |last4=Gianos |first4=Eugenia |last5=Kane |first5=Jamie |date=July 2021 |title=Novel Nutritional and Dietary Approaches to Weight Loss for the Prevention of Cardiovascular Disease: Ketogenic Diet, Intermittent Fasting, and Bariatric Surgery |url=https://link.springer.com/10.1007/s11886-021-01515-1 |journal=Current Cardiology Reports |language=en |volume=23 |issue=7 |pages=85 |doi=10.1007/s11886-021-01515-1 |pmid=34081228 |s2cid=235307329 |issn=1523-3782 |access-date=26 September 2022 |archive-date=1 March 2024 |archive-url=https://web.archive.org/web/20240301012409/https://link.springer.com/article/10.1007/s11886-021-01515-1 |url-status=live }}</ref> Studies have suggested that for people in ], an intermittent fasting regimen might " energy supply to vital organs and tissues... powerfully activates cell-protective and cellular repair pathways, including autophagy, mitochondrial biogenesis and antioxidant defenses, which may promote resilience to cellular stress."<ref>{{cite journal |vauthors=Gunst J, Casaer MP, Langouche L, Van den Berghe G |title=Role of ketones, ketogenic diets and intermittent fasting in ICU |journal=Curr Opin Crit Care |volume=27 |issue=4 |pages=385–389 |date=August 2021 |pmid=33967210 |doi=10.1097/MCC.0000000000000841 |s2cid=234345670 |url=https://lirias.kuleuven.be/handle/123456789/677319}}</ref> The effects of decreased serum glucose and depleted hepatic glycogen causing the body to switch to ketogenic metabolism are similar to the effects of reduced carbohydrate-based diets.{{citation needed|date=April 2022}} There is evidence demonstrating profound metabolic benefits of intermittent fasting in rodents.<ref name=":1" /> However, evidence is lacking or contradictory in humans and requires further investigation, especially over the long-term.<ref name=":1" /> Some evidence suggests that intermittent restriction of caloric intake has no weight-loss advantages over continuous calorie restriction plans.<ref>{{Cite journal |last1=Varady |first1=Krista A |last2=Bhutani |first2=Surabhi |last3=Church |first3=Emily C |last4=Klempel |first4=Monica C |date=2009-09-30 |title=Short-term modified alternate-day fasting: a novel dietary strategy for weight loss and cardioprotection in obese adults |journal=The American Journal of Clinical Nutrition |volume=90 |issue=5 |pages=1138–1143 |doi=10.3945/ajcn.2009.28380 |pmid=19793855 |issn=0002-9165|doi-access=free }}</ref><ref name=":1" /> For adults, fasting diets appear to be safe and tolerable, however there is a possibility that periods of fasting and hunger could lead to overeating<ref name=":1" /> and to weight regain after the fasting period.<ref name=":1" /> Adverse effects of fasting are often moderate and include halitosis, fatigue, weakness, and headaches.<ref name=":1" /> Fasting diets may be harmful to children and the elderly.<ref name=":1" /> | |||
===Proper nutrition=== | |||
Humans require essential nutrients from 5 broad classes: proteins, fats, ]s, ] and ]. Essential ] (protein) are required for cell, especially muscle, construction. Essential ] are required for brain and cell wall construction. Vitamins and minerals are essential for many functions. | |||
=== Exclusion Diet === | |||
Any diet that fails to meet minimum nutritional requirements can threaten general health (and physical fitness in particular). If a person is not well enough to be active, weight loss and good quality-of-life will be unlikely. | |||
This type of diet is based on the restriction of specific foods or food groups. Examples include gluten-free, Paleo, plant-based, and Mediterranean diets. | |||
Plant-based diets include vegetarian and vegan diets, and can range from the simple exclusion of meat products to diets that only include raw vegetables, fruits, nuts, seeds, legumes, and sprouted grains.<ref name=":2">{{Cite journal |last1=Melina |first1=Vesanto |last2=Craig |first2=Winston |last3=Levin |first3=Susan |date=December 2016 |title=Position of the Academy of Nutrition and Dietetics: Vegetarian Diets |url=http://dx.doi.org/10.1016/j.jand.2016.09.025 |journal=Journal of the Academy of Nutrition and Dietetics |volume=116 |issue=12 |pages=1970–1980 |doi=10.1016/j.jand.2016.09.025 |pmid=27886704 |s2cid=4984228 |issn=2212-2672 |access-date=1 March 2024 |archive-date=7 July 2022 |archive-url=https://web.archive.org/web/20220707010241/https://secure.jbs.elsevierhealth.com/action/getSharedSiteSession?redirect=https%3A%2F%2Fandjrnl.org%2Fretrieve%2Fpii%2FS2212267216311923&rc=0 |url-status=live }}</ref> Exclusion of animal products can reduce the intake of certain nutrients, which might lead to nutritional deficiencies of protein, iron, zinc, calcium, and vitamins D and B<sub>12</sub>.<ref name=":2" /> Therefore, long term implementation of a plant-based diet requires effective counseling and nutritional supplementation as necessary. Plant-based diets are effective for short-term treatment of overweight and obesity, likely due to the high consumption of low energy density foods.<ref name=":1" /> However, evidence for long-term efficacy is limited.<ref name=":1" /> | |||
The ] and the ] publish guidelines for dietary intakes of all known essential nutrients. | |||
The Paleo diet includes foods that it identifies as having been available to Paleolithic peoples<ref>{{Cite journal |last1=Agoulnik |first1=Dorothy |last2=Lalonde |first2=Mathieu Pascal |last3=Ellmore |first3=George S. |last4=McKeown |first4=Nicola M. |date=May 2021 |title=Part 1: The Origin and Evolution of the Paleo Diet |journal=Nutrition Today |language=en |volume=56 |issue=3 |pages=94–104 |doi=10.1097/NT.0000000000000482 |s2cid=235398211 |issn=1538-9839|doi-access=free }}</ref><ref>{{cite web |title=Diet Review: Paleo Diet for Weight Loss |url=https://nutritionsource.hsph.harvard.edu/healthy-weight/diet-reviews/paleo-diet/ |website=Harvard T.H. Chan School of Public Health |access-date=9 October 2024}}</ref> including meat, nuts, eggs, some oils, fresh fruits, and vegetables.<ref name=":1" /> Overall, it is high in protein and moderate in fats and carbohydrates. Some limited evidence suggests various health benefits and effective weight loss with this diet. However, similar to the plant-based diet, the Paleo diet has potential nutritional deficiency risks, specifically with vitamin D, calcium, and iodine.<ref name=":1" /> | |||
Sometimes dieters will take excessive amounts of vitamin and mineral supplements. While this is usually harmless, some nutrients are notably dangerous. Men (and women who don't ]) need to be wary of ]. Retinol (oil-soluble vitamin A) is toxic in large doses. | |||
Gluten-free diets are often used for weight loss but little has been studied about the efficacy of this diet and metabolic mechanism for its effectiveness is unclear.<ref name=":1" /> | |||
A sensible weight-loss diet is a normal balanced diet; it just comes with smaller portions. Extreme diets (based on caprice or obsession) will likely lead to malnutrition. | |||
The Mediterranean diet is characterized by high consumption of vegetables, fruits, legumes, whole-grain cereals, seafood, olive oil, and nuts. Red meat, dairy and alcohol are only recommended in moderation. Studies show that the Mediterranean diet is associated with short term as well as long term weight loss in addition to health and metabolic benefits.<ref name=":1" /> | |||
===How the body gets rid of fat=== | |||
All body processes require energy to run properly. When the body is expending more energy than it is taking in (e.g. when exercising), body cells rely on internally stored energy sources, like complex carbohydrates and fats, for energy. The first source the body turns to is glycogen, which is a complex carbohydrate created by the body. When that source is nearly depleted, the body begins ], the metabolism of fat for energy. In this process, fats, obtained from fat cells, are broken down into ] and ], which can be used to make energy. The primary by-products of metabolism are carbon dioxide and water; carbon dioxide is expelled through the respiratory system. | |||
===Detox=== | |||
Fats are also secreted by the ] (in the skin). | |||
{{Main|Detox diet}} | |||
Detox diets are promoted with unsubstantiated claims that they can eliminate "toxins" from the human body. Many of these diets use ]s or ] and other juicy low-] ]s. Detox diets can include fasting or exclusion (as in ]). Detox diets tend to result in short-term weight loss (because of calorie restriction), followed by weight gain.<ref>{{Cite journal |last1=Obert |first1=Jonathan |last2=Pearlman |first2=Michelle |last3=Obert |first3=Lois |last4=Chapin |first4=Sarah |date=December 2017 |title=Popular Weight Loss Strategies: a Review of Four Weight Loss Techniques |url=http://link.springer.com/10.1007/s11894-017-0603-8 |journal=Current Gastroenterology Reports |language=en |volume=19 |issue=12 |pages=61 |doi=10.1007/s11894-017-0603-8 |pmid=29124370 |s2cid=45802390 |issn=1522-8037 |access-date=1 March 2024 |archive-date=7 July 2022 |archive-url=https://web.archive.org/web/20220707010240/https://link.springer.com/article/10.1007/s11894-017-0603-8 |url-status=live }}</ref> | |||
===Environmentally sustainable=== | |||
==Psychological aspects of weight-loss dieting== | |||
{{see also|Environmental vegetarianism}} | |||
Diets affect the "energy in" component of the energy balance by limiting or altering the distribution of foods. Techniques that affect the ] can limit energy intake by affecting the desire to overeat. | |||
Another kind of diet focuses not on the dieter's health effects, but on its environment. The One Blue Dot plan of the BDA<ref>{{cite web|author1=BDA|date=20 November 2018|title=Environmentally sustainable diets are a Win-Win for the planet and health say dietitians|url=https://www.bda.uk.com/news/view?id=221&x=news/list |access-date=22 October 2019|website=www.bda.uk.com}}</ref> offers recommendations towards reducing diets' environmental impacts, by: | |||
# Reducing meat to 70g per person per day. | |||
# Prioritising plant proteins. | |||
# Promoting fish from sustainable sources. | |||
# Moderate dairy consumption. | |||
# Focusing on wholegrain starchy foods. | |||
# Promoting seasonal locally sourced fruits and vegetables. | |||
# Reducing high fat, sugar and salty foods overconsumption. | |||
# Promoting tap water and unsweetened tea/coffee as the de facto choice for healthy hydration. | |||
# Reducing ]. | |||
==Effectiveness== | |||
Consumption of low-energy, fiber-rich foods, such as non-starchy vegetables, is effective in obtaining satiation (the feeling of "fullness"). Exercise is also useful in controlling appetite. (Extreme physical fatigue, such as experienced by soldiers and mountain climbers, can make eating a difficult chore.) | |||
Several diets are effective for short-term ] for ] individuals,<ref name="USGuidelines2013"/><ref name="Thom2017" /> with diet success most predicted by adherence and little effect resulting from the type or brand of diet.<ref name="Thom2017" /><ref name="Wadden2012">{{cite journal | vauthors = Wadden TA, Webb VL, Moran CH, Bailer BA | title = Lifestyle modification for obesity: new developments in diet, physical activity, and behavior therapy | journal = Circulation | volume = 125 | issue = 9 | pages = 1157–1170 | date = March 2012 | pmid = 22392863 | pmc = 3313649 | doi = 10.1161/CIRCULATIONAHA.111.039453 | type = Narrative review }}</ref><ref name="Matarese2014">{{cite journal | vauthors = Matarese LE, Pories WJ | title = Adult weight loss diets: metabolic effects and outcomes | journal = Nutrition in Clinical Practice | volume = 29 | issue = 6 | pages = 759–767 | date = December 2014 | pmid = 25293593 | doi = 10.1177/0884533614550251 | type = Review }}</ref><ref name="Atallah2014">{{cite journal | vauthors = Atallah R, Filion KB, Wakil SM, Genest J, Joseph L, Poirier P, Rinfret S, Schiffrin EL, Eisenberg MJ | display-authors = 6 | title = Long-term effects of 4 popular diets on weight loss and cardiovascular risk factors: a systematic review of randomized controlled trials | journal = Circulation: Cardiovascular Quality and Outcomes | volume = 7 | issue = 6 | pages = 815–827 | date = November 2014 | pmid = 25387778 | doi = 10.1161/CIRCOUTCOMES.113.000723 | type = Systematic review of RCTs | doi-access = free }}</ref><ref name="Johnstone2014">{{cite journal | vauthors = Johnston BC, Kanters S, Bandayrel K, Wu P, Naji F, Siemieniuk RA, Ball GD, Busse JW, Thorlund K, Guyatt G, Jansen JP, Mills EJ | display-authors = 6 | title = Comparison of weight loss among named diet programs in overweight and obese adults: a meta-analysis | journal = JAMA | volume = 312 | issue = 9 | pages = 923–933 | date = September 2014 | pmid = 25182101 | doi = 10.1001/jama.2014.10397 | type = Meta-analysis | doi-access = free }}</ref><ref name="Ignatius2006">{{cite journal | vauthors = Zarraga IG, Schwarz ER | title = Impact of dietary patterns and interventions on cardiovascular health | journal = Circulation | volume = 114 | issue = 9 | pages = 961–973 | date = August 2006 | pmid = 16940205 | doi = 10.1161/CIRCULATIONAHA.105.603910 | type = Review | doi-access = free }}</ref> As weight maintenance depends on ] intake,<ref name="Thom2017"/><ref name="JAMA Dieting Patient Page"/> diets emphasising certain ]s (low-fat, low-carbohydrate, etc.) have been shown to be no more effective than one another and no more effective than diets that maintain a typical mix of foods with smaller portions and perhaps some substitutions (e.g. low-fat milk, or less salad dressing).<ref name=obes>{{cite journal | vauthors = Churuangsuk C, Kherouf M, Combet E, Lean M | title = Low-carbohydrate diets for overweight and obesity: a systematic review of the systematic reviews | journal = Obesity Reviews | volume = 19 | issue = 12 | pages = 1700–1718 | date = December 2018 | pmid = 30194696 | doi = 10.1111/obr.12744 | type = Systematic review | s2cid = 52174104 | url = http://eprints.gla.ac.uk/168899/1/168899.pdf | access-date = 23 September 2019 | archive-date = 23 September 2019 | archive-url = https://web.archive.org/web/20190923071822/http://eprints.gla.ac.uk/168899/1/168899.pdf | url-status = live }}</ref><ref name="sacks"/><ref>{{cite journal | vauthors = Schooff M | title = Are low-fat diets better than other weight-reducing diets in achieving long-term weight loss? | journal = American Family Physician | volume = 67 | issue = 3 | pages = 507–508 | date = February 2003 | pmid = 12588072 | url = http://www.aafp.org/afp/20030201/cochrane.html | access-date = 5 November 2008 | url-status = dead | archive-url = https://web.archive.org/web/20080515220502/http://www.aafp.org/afp/20030201/cochrane.html | archive-date = 15 May 2008 }}</ref> A ] of six randomized controlled trials found no difference between low-calorie, low-carbohydrate, and low-fat diets in terms of short-term weight loss, with a 2–4 kilogram weight loss over 12–18 months in all studies.<ref name=Strychar/> Diets that severely restrict calorie intake do not lead to long term weight loss.<ref name="Mann2007"/> Extreme diets may, in some cases, lead to malnutrition. | |||
A major challenge regarding weight loss and dieting relates to compliance.<ref name="Thom2017" /> While dieting can effectively promote weight loss in the short term, the intervention is hard to maintain over time and suppresses skeletal muscle ]. Suppressed thermogenesis accelerates weight regain once the diet stops, unless that phase is accompanied by a well-timed exercise intervention, as described by the ].<ref>{{cite journal | vauthors = Summermatter S, Handschin C | title = PGC-1α and exercise in the control of body weight | journal = International Journal of Obesity | volume = 36 | issue = 11 | pages = 1428–1435 | date = November 2012 | pmid = 22290535 | doi = 10.1038/ijo.2012.12 | doi-access = free }}</ref> Most diet studies do not assess long-term weight loss.<ref name="Thom2017" /> | |||
The use of drugs to control appetite is (potentially) dangerous. Stimulants are often taken as a means to ignore (normal, healthy) hunger by people who are not actually overweight. | |||
Some studies have found that, on average, short-term dieting results in a "meaningful" long-term weight-loss, although limited because of gradual 1 to 2 kg/year weight regain.<ref name="USGuidelines2013" /><ref name="Thom2017" /><ref name="Anderson 579–584"/> Because people who do not participate in weight-loss programs also tend to gain weight over time, and baseline data from such "untreated" participants are typically not included in diet studies, it is possible that diets do result in lower weights in the long-term relative to people who do not diet.<ref name="Thom2017" /> Others have suggested that dieting is ineffective as a long-term intervention.<ref name="Mann2007" /> For each individual, the results will be different, with some even regaining more weight than they lost, while a few others achieve a tremendous loss, so that the "average weight loss" of a diet is not indicative of the results other dieters may achieve.<ref name="Thom2017" /><ref name="Mann2007">{{cite journal | vauthors = Mann T, Tomiyama AJ, Westling E, Lew AM, Samuels B, Chatman J | title = Medicare's search for effective obesity treatments: diets are not the answer | journal = The American Psychologist | volume = 62 | issue = 3 | pages = 220–233 | date = April 2007 | pmid = 17469900 | doi = 10.1037/0003-066x.62.3.220 | quote = In sum, there is little support for the notion that diets lead to lasting weight loss or health benefits. | citeseerx = 10.1.1.666.7484 | s2cid = 4006392 }}</ref> A 2001 meta-analysis of 29 American studies found that participants of structured weight-loss programs maintained an average of 23% (3 kg) of their initial weight loss after five years, representing a sustained 3.2% reduction in body mass.<ref name="Anderson 579–584"/> Unfortunately, patients are generally unhappy with weight loss of <10%,<ref name="Thom2017" /> and reductions even as high as 10% are insufficient for changing someone with an "obese" BMI to a "normal weight" BMI. | |||
] or ] is a common problem. Sufferers often turn to ], ] and ]. While these and other sources of support are valid, dieters must beware. | |||
Partly because diets do not reliably produce long-term positive health outcomes, some argue against using weight loss as a goal, preferring other measures of health such as improvements in ],<ref name="harrington">{{cite journal |author1= Harrington M |author2=Gibson S |author3=Cottrell RC |title= A review and meta-analysis of the effect of weight loss on all-cause mortality risk |journal=Nutr Res Rev |year=2009 |volume=22|issue=1|pages=93–108 |pmid=19555520 |doi=10.1017/S0954422409990035|doi-access=free }}</ref><ref>{{cite journal|last1=Mann|first1=Traci|last2= Tomiyama|first2=Janet A.|last3=Westling|first3=Erika|last4=Lew|first4=Ann-Marie|last5=Samuels|first5=Barbra|last6=Chatman|first6=Jason|title=Medicare's search for effective obesity treatments: Diets are not the answer.|journal=American Psychologist|date=April 2007|volume=62 | issue = 3|series=Eating Disorders|pages=220–233 |doi=10.1037/0003-066x.62.3.220|pmid=17469900|citeseerx=10.1.1.666.7484|s2cid=4006392 }}</ref> sometimes called a ] (HAES) approach<ref name="weight science">{{cite journal |title= Weight science: evaluating the evidence for a paradigm shift |author= Bacon L, Aphramor L. |journal=Nutr J |year=2011 |volume=10|pmc=3041737 |pmid=21261939 |doi=10.1186/1475-2891-10-9 |pages=9|last2= Aphramor |doi-access= free }}</ref> or a "weight neutral" approach.<ref>{{cite journal |last1=Mensinger |first1=JL |last2=Calogero |first2=RM |last3=Stranges |first3=S |last4=Tylka |first4=TL |title=A weight-neutral versus weight-loss approach for health promotion in women with high BMI: A randomized-controlled trial |journal=Appetite |date=2016 |volume=105|pages=364–374 |doi=10.1016/j.appet.2016.06.006 |pmid=27289009 |s2cid=205613776 }}</ref> | |||
Some "diet ]" are ]. Others are well-meaning but focus on psychology or philosophy at the expense of practical solutions. Diets designed to appeal to people emotionally are often either very difficult to follow (i.e., too strict) or useless (i.e., too lenient). | |||
Long term losses from dieting are best maintained with continuing professional support, long term increases in physical activity, the use of anti-obesity medications, continued use of meal replacements, and additional periods of dieting to undo weight regain.<ref name="Thom2017" /> The most effective approach to weight loss is an in-person, high-intensity, comprehensive lifestyle intervention: overweight or obese adults should maintain regular (at least monthly) contact with a trained interventionalist who can help them engage in exercise, monitor their body weight, and reduce their calorie consumption.<ref name="USGuidelines2013"/> Even with high-intensity, comprehensive lifestyle interventions (consisting of diet, physical exercise, and bimonthly or even more frequent contact with trained interventionists), gradual weight regain of 1–2 kg/year still occurs.<ref name="USGuidelines2013"/> For patients at high medical risk, bariatric surgery or medications may be warranted in addition to the lifestyle intervention, as dieting by itself may not lead to sustained weight loss.<ref name="USGuidelines2013"/> | |||
==Weight loss groups== | |||
There exist both profit-oriented and non-profit weight loss organizations who assist people in their weight loss efforts. Examples of the former include ] and ]; examples of the latter include ], as well as a multitude of non-branded support groups run by local churches, hospitals, and like-minded individuals. | |||
Many studies overestimate the benefits of calorie restriction because the studies confound exercise and diet (testing the effects of diet and exercise as a combined intervention, rather than the effects of diet alone).<ref>{{cite journal | vauthors = Mann T, Tomiyama AJ, Westling E, Lew AM, Samuels B, Chatman J | title = Medicare's search for effective obesity treatments: diets are not the answer | journal = The American Psychologist | volume = 62 | issue = 3 | pages = 220–233 | date = April 2007 | pmid = 17469900 | doi = 10.1037/0003-066x.62.3.220 | series = Eating Disorders | citeseerx = 10.1.1.666.7484 | s2cid = 4006392 }}</ref> | |||
These organizations' customs and practices differ widely. Some groups are modelled on ], while others | |||
are quite informal. Some groups advocate certain prepared foods or special menus, while others train dieters to make healthy choices from restaurant menus and while grocery-shopping and cooking. | |||
=== Adverse effects === | |||
Most groups leverage the power of group meetings to provide counseling, emotional support, problem-solving, and useful information. | |||
==== Increased mortality rate ==== | |||
A number of studies have found that intentional weight loss is associated with an increase in ] in people without weight-related health problems.<ref name="weight science2">{{cite journal | vauthors = Bacon L, Aphramor L | title = Weight science: evaluating the evidence for a paradigm shift | journal = Nutrition Journal | volume = 10 | pages = 9 | date = January 2011 | pmid = 21261939 | pmc = 3041737 | doi = 10.1186/1475-2891-10-9 | doi-access = free }}</ref><ref>{{cite journal | vauthors = Gaesser GA | title = Thinness and weight loss: beneficial or detrimental to longevity? | journal = Medicine and Science in Sports and Exercise | volume = 31 | issue = 8 | pages = 1118–1128 | date = August 1999 | pmid = 10449013 | doi = 10.1097/00005768-199908000-00007 | doi-access = free }}</ref><ref>{{cite journal | vauthors = Sørensen TI, Rissanen A, Korkeila M, Kaprio J | title = Intention to lose weight, weight changes, and 18-y mortality in overweight individuals without co-morbidities | journal = PLOS Medicine | volume = 2 | issue = 6 | pages = e171 | date = June 2005 | pmid = 15971946 | pmc = 1160579 | doi = 10.1371/journal.pmed.0020171 | doi-access = free }}</ref><ref>{{cite journal | vauthors = Ingram DD, Mussolino ME | title = Weight loss from maximum body weight and mortality: the Third National Health and Nutrition Examination Survey Linked Mortality File | journal = International Journal of Obesity | volume = 34 | issue = 6 | pages = 1044–1050 | date = June 2010 | pmid = 20212495 | doi = 10.1038/ijo.2010.41 | doi-access = free }}</ref> A 2009 meta-analysis of 26 studies found that "intentional weight loss had a small benefit for individuals classified as unhealthy (with obesity-related risk factors), especially unhealthy obese, but appeared to be associated with slightly increased mortality for healthy individuals, and for those who were overweight but not obese."<ref name="harrington2"/> | |||
==== Dietary supplements ==== | |||
==Popular Weight-Loss diets== | |||
Due to extreme or unbalanced diets, dietary supplements are sometimes taken in an attempt to replace missing vitamins or minerals. While some supplements could be helpful for people eating an unbalanced diet (if replacing essential nutrients, for example), overdosing on any dietary supplement can cause a range of side effects depending on the supplement and dose that is taken.<ref name=":0">{{Cite web|title=Office of Dietary Supplements - Dietary Supplements: What You Need to Know|url=https://ods.od.nih.gov/factsheets/WYNTK-Consumer/|access-date=2021-05-03|website=ods.od.nih.gov|language=en|archive-date=24 April 2021|archive-url=https://web.archive.org/web/20210424203351/https://ods.od.nih.gov/factsheets/WYNTK-Consumer/|url-status=live}}</ref> Supplements should not replace foods that are important to a healthy diet.<ref name=":0" /> | |||
Popular diets (sometimes pejoratively called "fad diets") usually derive their popularity from the ] of their proponents. These proponents include "diet ]" and celebrity converts. "Diet books" are the primary means of communicating the specifics of popular diets. | |||
====Eating disorders==== | |||
Most popular diets experience short-lived popularity, partly because new diet books are continuously being published. | |||
In an editorial for '']'', George Hsu concludes that dieting is likely to lead to the development of an ] in the presence of certain risk factors.<ref>{{cite journal | vauthors = Hsu LK | title = Can dieting cause an eating disorder? | journal = Psychological Medicine | volume = 27 | issue = 3 | pages = 509–513 | date = May 1997 | pmid = 9153671 | doi = 10.1017/S0033291797004753 | doi-access = free }}</ref> A 2006 study found that dieting and unhealthy weight-control behaviors were predictive of obesity and eating disorders five years later, with the authors recommending a "shift away from dieting and drastic weight-control measures toward the long-term implementation of healthful eating and physical activity".<ref>{{cite journal | vauthors = Neumark-Sztainer D, Wall M, Guo J, Story M, Haines J, Eisenberg M | title = Obesity, disordered eating, and eating disorders in a longitudinal study of adolescents: how do dieters fare 5 years later? | journal = Journal of the American Dietetic Association | volume = 106 | issue = 4 | pages = 559–568 | date = April 2006 | pmid = 16567152 | doi = 10.1016/j.jada.2006.01.003 | author2-link = Melanie Wall }}{{Dead link|date=May 2021 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> | |||
==Mechanism== | |||
Judging the effectiveness (and nutritional merit) of popular diets can be especially difficult. Diet proponents often locate medical professionals to back up their work. And some diets are so ] that they divide the medical community. | |||
When the body is expending more energy than it is consuming (e.g. when exercising), the body's cells rely on internally stored energy sources, such as complex carbohydrates and fats, for energy. The first source to which the body turns is ] (by ]). Glycogen is a complex carbohydrate, 65% of which is stored in skeletal muscles and the remainder in the liver (totaling about 2,000 ] in the whole body). It is created from the excess of ingested ], mainly carbohydrates. When glycogen is nearly depleted, the body begins ], the mobilization and catabolism of fat stores for energy. In this process fats, obtained from adipose tissue, or ], are broken down into ] and ], which can be used to generate energy.<ref>{{cite journal | vauthors = O'Rourke B, Cortassa S, Aon MA | title = Mitochondrial ion channels: gatekeepers of life and death | journal = Physiology | volume = 20 | issue = 5 | pages = 303–315 | date = October 2005 | pmid = 16174870 | pmc = 2739045 | doi = 10.1152/physiol.00020.2005 }}</ref> The primary by-products of metabolism are carbon dioxide and water; carbon dioxide is expelled through the respiratory system. | |||
=== Set-Point Theory === | |||
Many popular diets advocate the combination a specific technique (such as eliminating a certain food, or eating only certain combinations of foods) with reduced caloric intake, with the goal being to accelerate weight loss. Others ignore traditional science altogether. | |||
{{see also|Energy homeostasis#Imbalance}} | |||
The Set-Point Theory, first introduced in 1953, postulated that each body has a preprogrammed fixed weight, with regulatory mechanisms to compensate. This theory was quickly adopted and used to explain failures in developing effective and sustained weight loss procedures. A 2019 systematic review of multiple weight change procedures, including alternate day fasting and time-restricted feeding but also exercise and overeating, found systematic "energetic errors" for all these procedures. This shows that the body cannot precisely compensate for errors in energy/calorie intake, countering the Set-Point Theory and potentially explaining both ] and weight gain such as ]. This review was conducted on short-term studies, therefore such a mechanism cannot be excluded in the long term, as evidence is currently lacking on this timeframe.<ref>{{cite journal | vauthors = Levitsky DA, Sewall A, Zhong Y, Barre L, Shoen S, Agaronnik N, LeClair JL, Zhuo W, Pacanowski C | display-authors = 6 | title = Quantifying the imprecision of energy intake of humans to compensate for imposed energetic errors: A challenge to the physiological control of human food intake | journal = Appetite | volume = 133 | pages = 337–343 | date = February 2019 | pmid = 30476522 | doi = 10.1016/j.appet.2018.11.017 | s2cid = 53712116 }}</ref> | |||
==Methods== | |||
===Meal timing=== | |||
A meal timing schedule is known to be an important factor of any diet. Recent evidence suggest that new scheduling strategies, such as ] or skipping meals, and strategically placed snacks before meals, may be recommendable to reduce cardiovascular risks as part of a broader lifestyle and ].<ref name="AHA2017">{{cite journal | vauthors = St-Onge MP, Ard J, Baskin ML, Chiuve SE, Johnson HM, Kris-Etherton P, Varady K | title = Meal Timing and Frequency: Implications for Cardiovascular Disease Prevention: A Scientific Statement From the American Heart Association | journal = Circulation | volume = 135 | issue = 9 | pages = e96–e121 | date = February 2017 | pmid = 28137935 | pmc = 8532518 | doi = 10.1161/cir.0000000000000476 | publisher = Ovid Technologies (Wolters Kluwer Health) | doi-access = free | author7-link = Krista Varady }}</ref> | |||
===Food diary=== | |||
A 2008 study published in the ] showed that dieters who kept a daily food ] (or diet journal), lost twice as much weight as those who did not keep a food log, suggesting that if a person records their eating, they are more aware of what they consume and therefore eat fewer calories.<ref>{{cite news | title= Using food diaries doubles weight loss, study shows | url= https://www.usatoday.com/news/health/weightloss/2008-07-08-food-diaries%5FN.htm | date= 8 July 2008 | work= USA Today | vauthors= Hellmich N | access-date= 1 May 2010 | archive-date= 14 March 2012 | archive-url= https://web.archive.org/web/20120314035350/http://www.usatoday.com/news/health/weightloss/2008-07-08-food-diaries%5FN.htm | url-status= live }}</ref> | |||
=== |
===Water=== | ||
{{Main | Weight loss effects of water}} | |||
Low-fat diets were popular during the 1980s and 1990s, encouraging people to eat foods low in fat (or without fat altogether) and instead eat foods high in carbohydrates. | |||
A 2009 review found limited evidence suggesting that encouraging water consumption and substituting energy-free beverages for energy-containing beverages (i.e., reducing caloric intake) may facilitate ]. A 2009 article found that drinking 500 ml of water prior to meals for a 12-week period resulted in increased long-term weight reduction. (References given in ].) | |||
==Society== | |||
Unfortunately, the ] came to believe, partly due to information from low-fat diet proponents, that carbohydrates were "energy food" and that only fat made people fat. This led to excessive consumption of low-fat foods rich in refined carbohydrates (notably ]), which lead some people to gain more weight. | |||
It is estimated that about 1 out of 3 Americans is dieting at any given time. 85% of dieters are women. Approximately sixty billion dollars are spent every year in the USA on diet products, including "diet foods", such as light sodas, gym memberships or specific regimes.<ref>{{Cite web|url=https://money.usnews.com/money/personal-finance/articles/2013/01/02/the-heavy-price-of-losing-weight|title=The Heavy Price of Losing Weight|vauthors=Williams G|date=2 January 2013|website=US News|access-date=11 November 2019|archive-date=14 August 2021|archive-url=https://web.archive.org/web/20210814231213/https://money.usnews.com/money/personal-finance/articles/2013/01/02/the-heavy-price-of-losing-weight|url-status=live}}</ref><ref>{{Cite web|url=https://slate.com/technology/2015/03/diets-do-not-work-the-thin-evidence-that-losing-weight-makes-you-healthier.html|title=Planning to Go on a Diet? One Word of Advice: Don't.|vauthors=Brown H|date=2015-03-24|website=Slate Magazine|language=en|access-date=2019-11-11|archive-date=11 November 2019|archive-url=https://web.archive.org/web/20191111182011/https://slate.com/technology/2015/03/diets-do-not-work-the-thin-evidence-that-losing-weight-makes-you-healthier.html|url-status=live}}</ref> 80% of dieters start by themselves, whereas 20% see a professional or join a paid program. The typical dieter attempts 4 tries per year.<ref>{{cite book | vauthors = Berger AA |title=Perspectives on everyday life : a cross disciplinary cultural analysis |date=2018 |publisher=Palgrave Pivot, Cham |isbn=978-3-319-99794-0}}</ref> | |||
===Weight loss groups=== | |||
Some low-fat diets were healthier, focusing on consumption of whole grains, vegetables and lean meats. (See ].) But even these diets did not recognize the importance of essential fatty acids. | |||
Some weight loss groups aim to make money, others work as charities. The former include ] and ]. The latter include ], ] and groups run by local organizations. | |||
These organizations' customs and practices differ widely. Some groups are modelled on ]s, while others are quite informal. Some groups advocate certain prepared foods or special menus, while others train dieters to make healthy choices from restaurant menus and while grocery-shopping and cooking.{{Citation needed|date=September 2021}} | |||
===Atkins (low-carbohydrate diet)=== | |||
] is a very popular diet. | |||
Dr. ]' concept, somewhat exaggerated by the media, that a person can lose weight whilst gorging on meat, has captured the public's imagination. The success of those who tried the diet varied depending on the degree they adhered to the long term stages of the diet structure. The Atkins diet was originally designed for diabetes patients who wanted to manage their insulin levels more effectively. The diet was also embraced by those seeking a diet that allows eating to satiation. | |||
Attending group meetings for ] programmes rather than receiving one-on-one support may increase the likelihood that ] people will lose weight. Those who participated in groups had more treatment time and were more likely to lose enough weight to improve their health. Study authors suggested that one explanation for the difference is that group participants spent more time with the clinician (or whoever delivered the programme) than those receiving one-on-one support.<ref>{{Cite journal |date=2021-08-27 |title=Group programmes for weight loss may be more effective than one-to-one sessions |url=https://evidence.nihr.ac.uk/alert/group-weight-loss-programmes-more-effective-than-one-to-one-sessions/ |journal=NIHR Evidence |type=Plain English summary |language=en |doi=10.3310/alert_47460 |s2cid=241732368 |access-date=22 June 2022 |archive-date=22 June 2022 |archive-url=https://web.archive.org/web/20220622083140/https://evidence.nihr.ac.uk/alert/group-weight-loss-programmes-more-effective-than-one-to-one-sessions/ |url-status=live }}</ref><ref>{{Cite journal |last1=Abbott |first1=S. |last2=Smith |first2=E. |last3=Tighe |first3=B. |last4=Lycett |first4=D. |date=2020-12-28 |title=Group versus one-to-one multi-component lifestyle interventions for weight management: a systematic review and meta-analysis of randomised controlled trials |url=https://onlinelibrary.wiley.com/doi/10.1111/jhn.12853 |journal=Journal of Human Nutrition and Dietetics |language=en |volume=34 |issue=3 |pages=485–493 |doi=10.1111/jhn.12853 |pmid=33368624 |s2cid=229691531 |issn=0952-3871 |access-date=22 June 2022 |archive-date=22 June 2022 |archive-url=https://web.archive.org/web/20220622083106/https://onlinelibrary.wiley.com/doi/10.1111/jhn.12853 |url-status=live }}</ref> | |||
Atkins discourages refined carbohydrate intake and encourages protein intake, especially in the form of meat. The diet encourages the consumption of fruits and non-starchy vegetables for the provision of fiber and nutrients; it takes a somewhat neutral stand on fat intake. | |||
== See also == | |||
Many people experience rapid initial weight loss on Atkins, some of which is due to depletion of glycogen stores in the liver. (Glycogen in the body is associated with several times its weight in water.) | |||
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Low carbohydrate diets have been shown to reduce the fasting levels of ]. Elevated triglycerides are a demonstrated risk factor for heart disease. (Low-fat diets also reduce fasting levels of triglycerides.) | |||
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A low-carbohydrate diet may not be suitable as a weight-maintenance diet (long-term). The products of fat metabolism (]) and protein metabolism (]) include ]. | |||
*] | |||
Note: Any successful weight-loss diet will cause some acidosis; symptoms range from mild fatigue to severe joint pain. Acidosis can be controlled by drinking water (in large amounts) and taking ] supplements (or eating vegetables grown in alkaline soil). | |||
Note: Human metabolism is enormously complicated. Diets whose effectiveness is not based on the simple balance of energy must be evaluated experimentally. The premise that protein is less fattening than carbohydrates is unproven. | |||
===Natural Diets=== | |||
Since the advent of controversial diets such as Atkins, various diets that stress the eating habits of "natural humans" have been developed. The ] explains "what and how we were designed to eat"; the ] imitates the way people ate during the ]. | |||
===Vegetarian diet=== | |||
There is a growing body of evidence that vegetarian diets can prevent obesity and lower disease risks. | |||
According to the ], "Vegetarians have been reported to have lower body mass indices than nonvegetarians, as well as lower rates of death from ischemic heart disease; vegetarians also show lower blood cholesterol levels; lower blood pressure; and lower rates of hypertension, type 2 diabetes, and prostate and colon cancer." | |||
Vegans on average weigh 10 percent less than non-vegetarians. And in a year-long study comparing Dean Ornish's vegetarian diet to Weight Watchers, The Zone Diet, and The Atkins Diet, subjects on Dean Ornish's diet achieved the most weight loss (on average). | |||
==Very Low Calorie Diet== | |||
The Very Low Calorie Diet (VLCD) is a prescribed diet for obese patients. Daily intake consists of three ] formula drinks (made with powder concentrate and water), which supply about 2000 kilojoules (500 Calories) and all necessary vitamins and minerals. | |||
There are risks to this diet. A patient who drinks more formula than allowed can get too much iron and selenium. ] is a problem: extra water and (fiber) laxatives may be required. ] may be compromised. | |||
VLCD should only be used for dieting when a patient's ] exceeds 30. The diet requires regular consultation between patient and doctor. | |||
VLCD can be very successful when used over a 6-12 week period. As with all starvation diets, metabolism will fall. A sensible diet-and-exercise plan must follow cessation of VLCD, or weight will be gained back. | |||
==Dangers of weight loss dieting== | |||
Strange or extreme diets can be very dangerous, and they are often ineffective. If one seeks the sensible and popular ideal of being lean and athletic, then starvation diets are counterproductive. | |||
===Diet pills=== | |||
There are many diet pills for sale, some which are associated with comprehensive dietary programs. Many such pills, including many of those containing ] and ], are not effective for losing weight. | |||
Some drugs enable short-term weight loss, usually with unpleasant and potentially dangerous side effects. The drugs include (physiologically active) ] products available at ] stores, as well as over-the-counter (OTC) and prescribed medications provided by doctors and pharmacists. | |||
Typically these drugs fall into two classes: ] to induce water-weight loss and ] (such as ]) to increase heart rate and reduce appetite. Both classes of drugs can cause kidney and liver damage, and stimulants can cause sudden heart attacks and ]. | |||
===Yo-yo dieting=== | |||
] is defined by alternating periods of feast and famine (that the dieter deliberately undertakes). It is a particularly ineffective method of sustaining weight loss. | |||
The human body responds to starvation by decreasing metabolism. When food is again available, it is stored immediately as fat. This survival mechanism, while a useful response to genuine food scarcity, leaves the yo-yo dieter feeling lethargic and fatigued (and defeated). | |||
Metabolism can be restored to a higher level with exercise and a sensible weight-loss diet. This diet is defined by the minimum safe daily caloric intake of 75 percent of the basal metabolic rate or 4200 kilojoules (1000 Calories), whichever is greater. (Those eating less should do so only under medical supervision. Parents and guardians should consult medical professionals before placing their children on any type of diet.) | |||
Once an ideal weight is attained, a weight-maintenance diet is essential. This requires limiting excess caloric intake and making small changes in caloric intake in response to physical observations (of one's weight and appearance). | |||
===Scientific analysis of the dangers of fasting (and discussion of partial fasting with protein supplementation)=== | |||
While anyone can lose weight by ] (temporarily stopping one's food intake), it is a dangerous practice. When ] survivors, who involuntarily suffered famine as a result of horrendous living conditions, were examined by doctors, what little weight they had was mostly fat, with practically no muscle. | |||
The muscle loss is partly due to the fact that the brain cannot rely completely on fat for fuel. The brain usually reserves ketones for lipid synthesis but will use ] (from fat) for some energy once levels rise during carbohydrate shortages or starvation, but it must get at least 15 percent of its energy from ], and it takes a much greater percentage than this early in a fast before the switch to ketones for most energy needs. Glucose can only be synthesized from proteins, glycerol and carbohydrates. | |||
The body stores carbohydrates as fat and as glycogen in the muscles and the liver; glycogen is used to make glucose. Glycogen stores (from carbohydrates) can only last a couple days (during starvation). (In fact, ] runners experience a shortage of easily-available glycogen after only 2 hours: they speak of "hitting the wall".) | |||
Because fasts, very low calorie diets (VLCD), and low-carbohydrate diets restrict the intake of carbohydrates, glucose must be obtained from protein. If dietary protein is insufficient, internal sources will be obtained: ] and muscle wasting occurs. (The conversion of amino acids to glucose is called ].) | |||
A very low calorie diet that restricts all carbohydrates and non-essential fats, while providing just enough dietary protein to prevent muscle loss, is termed a "protein sparing modified fast" (PSMF). | |||
After experimentation, it was found that a protein intake of 1 to 1.5 grams of protein per kilogram of ideal bodyweight (lean body mass or LBM) prevented the loss of body protein. A somewhat "safer" intake of .8 to 1.2 grams of protein per pound of LBM is often recommended. (More active persons and those taking less protein must compensate by consuming at least some carbohydrates.) | |||
Thus, PSMF allows for rapid fat loss due to the severe caloric deficit that is created when nearly all carbohydrates and fats are removed from the diet. This extreme dieting technique has many potential hazards, such as hormonal changes and rapid metabolic slowdown. PSMF is sometimes used by ] to "get cut" (lose fat to expose muscle) just before competitions. | |||
===Side effects=== | |||
Dieting, especially extreme food-intake reduction, can have the following side effects: | |||
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==See also== | |||
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== |
== References == | ||
{{Reflist}} | |||
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* - Thermoregulation | |||
* - Dietary Reference Intakes | |||
* - High-Protein Diets | |||
== Further reading == | |||
==Sources== | |||
{{refbegin}} | |||
*Dansinger, M.L., Gleason, J. L., Griffith, J.L., et al., "One Year Effectiveness of the Atkins, Ornish, Weight Watchers, and Zone Diets in Decreasing Body Weight and Heart Disease Risk", Presented at the American Heart Association Scientific Sessions ], ] in Orlando, Florida.) | |||
* {{cite journal | author = American Dietetic Association | title = Position of the American Dietetic Association and Dietitians of Canada: Vegetarian diets | journal = Journal of the American Dietetic Association | volume = 103 | issue = 6 | pages = 748–765 | date = June 2003 | pmid = 12778049 | doi = 10.1053/jada.2003.50142 }} | |||
*American Dietetic Association. 2003. Position paper on vegetarian diets. J Am Diet Assoc. 103:748-765. | |||
* {{cite journal | vauthors = Cheraskin E | year = 1993 | title = The Breakfast/Lunch/Dinner Ritual | journal = Journal of Orthomolecular Medicine | volume = 8 | issue = 1}} | |||
*Davis, B. and Melina, V. 2000. ''Becoming Vegan.'' pg. 22. | |||
* {{cite conference | vauthors = Dansinger ML, Gleason JL, Griffith JL, Li WJ, Selker HP, Schaefer EJ | title = One Year Effectiveness of the Atkins, Ornish, Weight Watchers, and Zone Diets in Decreasing Body Weight and Heart Disease Risk | conference = American Heart Association Scientific Sessions | location = Orlando, Florida | date = 12 November 2003 }} | |||
*]. ''Never Satisfied: A Cultural History of Diets, Fantasies, and Fat''. New York: Free Press/Macmillan, 1986. | |||
{{refend}} | |||
== External links == | |||
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Latest revision as of 10:59, 18 December 2024
Regulation of the consumption of food
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Dieting is the practice of eating food in a regulated way to decrease, maintain, or increase body weight, or to prevent and treat diseases such as diabetes and obesity. As weight loss depends on calorie intake, different kinds of calorie-reduced diets, such as those emphasising particular macronutrients (low-fat, low-carbohydrate, etc.), have been shown to be no more effective than one another. As weight regain is common, diet success is best predicted by long-term adherence. Regardless, the outcome of a diet can vary widely depending on the individual.
The first popular diet was "Banting", named after William Banting. In his 1863 pamphlet, Letter on Corpulence, Addressed to the Public, he outlined the details of a particular low-carbohydrate, low-calorie diet that led to his own dramatic weight loss.
Some guidelines recommend dieting to lose weight for people with weight-related health problems, but not for otherwise healthy people. One survey found that almost half of all American adults attempt to lose weight through dieting, including 66.7% of obese adults and 26.5% of normal weight or underweight adults. Dieters who are overweight (but not obese), who are normal weight, or who are underweight may have an increased mortality rate as a result of dieting.
History
The word diet comes from the Greek δίαιτα (diaita), which represents a notion of a whole way healthy lifestyle including both mental and physical health, rather than a narrow weight-loss regimen.
One of the first dietitians was the English doctor George Cheyne. He himself was tremendously overweight and would constantly eat large quantities of rich food and drink. He began a meatless diet, taking only milk and vegetables, and soon regained his health. He began publicly recommending his diet for everyone who was obese. In 1724, he wrote An Essay of Health and Long Life, in which he advises exercise and fresh air and avoiding luxury foods.
The Scottish military surgeon, John Rollo, published Notes of a Diabetic Case in 1797. It described the benefits of a meat diet for those with diabetes, basing this recommendation on Matthew Dobson's discovery of glycosuria in diabetes mellitus. By means of Dobson's testing procedure (for glucose in the urine) Rollo worked out a diet that had success for what is now called type 2 diabetes.
The first popular diet was "Banting", named after the English undertaker William Banting. In 1863, he wrote a booklet called Letter on Corpulence, Addressed to the Public, which contained the particular plan for the diet he had successfully followed. His own diet was four meals per day, consisting of meat, greens, fruits, and dry wine. The emphasis was on avoiding sugar, sweet foods, starch, beer, milk and butter. Banting's pamphlet was popular for years to come, and would be used as a model for modern diets. The pamphlet's popularity was such that the question "Do you bant?" referred to his method, and eventually to dieting in general. His booklet remains in print as of 2007.
The first weight-loss book to promote calorie counting, and the first weight-loss book to become a bestseller, was the 1918 Diet and Health: With Key to the Calories by American physician and columnist Lulu Hunt Peters.
It was estimated that over 1000 weight-loss diets have been developed up to 2014.
Types
Main article: List of dietsA restricted diet is most commonly pursued by those who want to lose weight. Some people follow a diet to gain weight (such as people who are underweight or who are attempting to gain more muscle). Diets can also be used to maintain a stable body weight or to improve health.
Low-fat
Main article: Low-fat dietLow-fat diets involve the reduction of the percentage of fat in one's diet. Calorie consumption is reduced because less fat is consumed. Diets of this type include NCEP Step I and II. A meta-analysis of 16 trials of 2–12 months' duration found that low-fat diets (without intentional restriction of caloric intake) resulted in average weight loss of 3.2 kg (7.1 lb) over habitual eating.
A low-fat, plant-based diet has been found to improve control of weight, blood sugar levels, and cardiovascular health.
Low-carbohydrate
This section is an excerpt from Low-carbohydrate diet.
Low-carbohydrate diets restrict carbohydrate consumption relative to the average diet. Foods high in carbohydrates (e.g., sugar, bread, pasta) are limited, and replaced with foods containing a higher percentage of fat and protein (e.g., meat, poultry, fish, shellfish, eggs, cheese, nuts, and seeds), as well as low carbohydrate foods (e.g. spinach, kale, chard, collards, and other fibrous vegetables).
There is a lack of standardization of how much carbohydrate low-carbohydrate diets must have, and this has complicated research. One definition, from the American Academy of Family Physicians, specifies low-carbohydrate diets as having less than 20% of calories from carbohydrates.
There is no good evidence that low-carbohydrate dieting confers any particular health benefits apart from weight loss, where low-carbohydrate diets achieve outcomes similar to other diets, as weight loss is mainly determined by calorie restriction and adherence.
One form of low-carbohydrate diet called the ketogenic diet was first established as a medical diet for treating epilepsy. It became a popular diet for weight loss through celebrity endorsement, but there is no evidence of any distinctive benefit for this purpose and the diet carries a risk of adverse effects, with the British Dietetic Association naming it one of the "top five worst celeb diets to avoid" in 2018.Low-calorie
Main article: Calorie restrictionLow-calorie diets usually produce an energy deficit of 500–1,000 calories per day, which can result in a 0.5 to 1 kilogram (1.1 to 2.2 pounds) weight loss per week. The National Institutes of Health reviewed 34 randomized controlled trials to determine the effectiveness of low-calorie diets. They found that these diets lowered total body mass by 8% in the short term, over 3–12 months. Women doing low-calorie diets should have at least 1,000 calories per day and men should have approximately 1,200 calories per day. These caloric intake values vary depending on additional factors, such as age and weight.
Very low-calorie
Main article: Very low calorie dietVery low calorie diets provide 200–800 calories per day, maintaining protein intake but limiting calories from both fat and carbohydrates. They subject the body to starvation and produce an average loss of 1.5–2.5 kg (3.3–5.5 lb) per week. "2-4-6-8", a popular diet of this variety, follows a four-day cycle in which only 200 calories are consumed the first day, 400 the second day, 600 the third day, 800 the fourth day, and then totally fasting, after which the cycle repeats. There is some evidence that these diets results in considerable weight loss. These diets are not recommended for general use and should be reserved for the management of obesity as they are associated with adverse side effects such as loss of lean muscle mass, increased risks of gout, and electrolyte imbalances. People attempting these diets must be monitored closely by a physician to prevent complications.
The concept of crash dieting is to drastically reduce calories, using a very-low-calorie diet. Crash dieting can be highly dangerous because it can cause various kind of issues for the human body. Crash dieting can produce weight loss but without professional supervision all along, the extreme reduction in calories and potential unbalance in the diet's composition can lead to detrimental effects, including sudden death.
Fasting
Main articles: Fasting and Intermittent fastingFasting is the act of intentional taking a long time interval between meals. Lengthy fasting (multiple days in a week) might be dangerous due to the risk of malnutrition. During prolonged fasting or very low calorie diets the reduction of blood glucose, the preferred energy source of the brain, causes the body to deplete its glycogen stores. Once glycogen is depleted the body begins to fuel the brain using ketones, while also metabolizing body protein (including but not limited to skeletal muscle) to be used to synthesize sugars for use as energy by the rest of the body. Most experts believe that a prolonged fast can lead to muscle wasting, although some dispute this. The use of short-term fasting, or various forms of intermittent fasting, have been used as a form of dieting to circumvent the issues of long fasting.
Intermittent fasting commonly takes the form of periodic fasting, alternate-day fasting, time-restricted feeding, and/or religious fasting. It can be a form of reduced-calorie dieting but pertains entirely to when the metabolism is activated during the day for digestion. The changes to eating habits on a regular basis do not have to be severe or absolutely restrictive to see benefits to cardiovascular health, such as improved glucose metabolism, reduced inflammation, and reduced blood pressure. Studies have suggested that for people in intensive care, an intermittent fasting regimen might " energy supply to vital organs and tissues... powerfully activates cell-protective and cellular repair pathways, including autophagy, mitochondrial biogenesis and antioxidant defenses, which may promote resilience to cellular stress." The effects of decreased serum glucose and depleted hepatic glycogen causing the body to switch to ketogenic metabolism are similar to the effects of reduced carbohydrate-based diets. There is evidence demonstrating profound metabolic benefits of intermittent fasting in rodents. However, evidence is lacking or contradictory in humans and requires further investigation, especially over the long-term. Some evidence suggests that intermittent restriction of caloric intake has no weight-loss advantages over continuous calorie restriction plans. For adults, fasting diets appear to be safe and tolerable, however there is a possibility that periods of fasting and hunger could lead to overeating and to weight regain after the fasting period. Adverse effects of fasting are often moderate and include halitosis, fatigue, weakness, and headaches. Fasting diets may be harmful to children and the elderly.
Exclusion Diet
This type of diet is based on the restriction of specific foods or food groups. Examples include gluten-free, Paleo, plant-based, and Mediterranean diets.
Plant-based diets include vegetarian and vegan diets, and can range from the simple exclusion of meat products to diets that only include raw vegetables, fruits, nuts, seeds, legumes, and sprouted grains. Exclusion of animal products can reduce the intake of certain nutrients, which might lead to nutritional deficiencies of protein, iron, zinc, calcium, and vitamins D and B12. Therefore, long term implementation of a plant-based diet requires effective counseling and nutritional supplementation as necessary. Plant-based diets are effective for short-term treatment of overweight and obesity, likely due to the high consumption of low energy density foods. However, evidence for long-term efficacy is limited.
The Paleo diet includes foods that it identifies as having been available to Paleolithic peoples including meat, nuts, eggs, some oils, fresh fruits, and vegetables. Overall, it is high in protein and moderate in fats and carbohydrates. Some limited evidence suggests various health benefits and effective weight loss with this diet. However, similar to the plant-based diet, the Paleo diet has potential nutritional deficiency risks, specifically with vitamin D, calcium, and iodine.
Gluten-free diets are often used for weight loss but little has been studied about the efficacy of this diet and metabolic mechanism for its effectiveness is unclear.
The Mediterranean diet is characterized by high consumption of vegetables, fruits, legumes, whole-grain cereals, seafood, olive oil, and nuts. Red meat, dairy and alcohol are only recommended in moderation. Studies show that the Mediterranean diet is associated with short term as well as long term weight loss in addition to health and metabolic benefits.
Detox
Main article: Detox dietDetox diets are promoted with unsubstantiated claims that they can eliminate "toxins" from the human body. Many of these diets use herbs or celery and other juicy low-calorie vegetables. Detox diets can include fasting or exclusion (as in juice fasting). Detox diets tend to result in short-term weight loss (because of calorie restriction), followed by weight gain.
Environmentally sustainable
See also: Environmental vegetarianismAnother kind of diet focuses not on the dieter's health effects, but on its environment. The One Blue Dot plan of the BDA offers recommendations towards reducing diets' environmental impacts, by:
- Reducing meat to 70g per person per day.
- Prioritising plant proteins.
- Promoting fish from sustainable sources.
- Moderate dairy consumption.
- Focusing on wholegrain starchy foods.
- Promoting seasonal locally sourced fruits and vegetables.
- Reducing high fat, sugar and salty foods overconsumption.
- Promoting tap water and unsweetened tea/coffee as the de facto choice for healthy hydration.
- Reducing food waste.
Effectiveness
Several diets are effective for short-term weight loss for obese individuals, with diet success most predicted by adherence and little effect resulting from the type or brand of diet. As weight maintenance depends on calorie intake, diets emphasising certain macronutrients (low-fat, low-carbohydrate, etc.) have been shown to be no more effective than one another and no more effective than diets that maintain a typical mix of foods with smaller portions and perhaps some substitutions (e.g. low-fat milk, or less salad dressing). A meta-analysis of six randomized controlled trials found no difference between low-calorie, low-carbohydrate, and low-fat diets in terms of short-term weight loss, with a 2–4 kilogram weight loss over 12–18 months in all studies. Diets that severely restrict calorie intake do not lead to long term weight loss. Extreme diets may, in some cases, lead to malnutrition.
A major challenge regarding weight loss and dieting relates to compliance. While dieting can effectively promote weight loss in the short term, the intervention is hard to maintain over time and suppresses skeletal muscle thermogenesis. Suppressed thermogenesis accelerates weight regain once the diet stops, unless that phase is accompanied by a well-timed exercise intervention, as described by the Summermatter cycle. Most diet studies do not assess long-term weight loss.
Some studies have found that, on average, short-term dieting results in a "meaningful" long-term weight-loss, although limited because of gradual 1 to 2 kg/year weight regain. Because people who do not participate in weight-loss programs also tend to gain weight over time, and baseline data from such "untreated" participants are typically not included in diet studies, it is possible that diets do result in lower weights in the long-term relative to people who do not diet. Others have suggested that dieting is ineffective as a long-term intervention. For each individual, the results will be different, with some even regaining more weight than they lost, while a few others achieve a tremendous loss, so that the "average weight loss" of a diet is not indicative of the results other dieters may achieve. A 2001 meta-analysis of 29 American studies found that participants of structured weight-loss programs maintained an average of 23% (3 kg) of their initial weight loss after five years, representing a sustained 3.2% reduction in body mass. Unfortunately, patients are generally unhappy with weight loss of <10%, and reductions even as high as 10% are insufficient for changing someone with an "obese" BMI to a "normal weight" BMI.
Partly because diets do not reliably produce long-term positive health outcomes, some argue against using weight loss as a goal, preferring other measures of health such as improvements in cardiovascular biomarkers, sometimes called a Health at Every Size (HAES) approach or a "weight neutral" approach.
Long term losses from dieting are best maintained with continuing professional support, long term increases in physical activity, the use of anti-obesity medications, continued use of meal replacements, and additional periods of dieting to undo weight regain. The most effective approach to weight loss is an in-person, high-intensity, comprehensive lifestyle intervention: overweight or obese adults should maintain regular (at least monthly) contact with a trained interventionalist who can help them engage in exercise, monitor their body weight, and reduce their calorie consumption. Even with high-intensity, comprehensive lifestyle interventions (consisting of diet, physical exercise, and bimonthly or even more frequent contact with trained interventionists), gradual weight regain of 1–2 kg/year still occurs. For patients at high medical risk, bariatric surgery or medications may be warranted in addition to the lifestyle intervention, as dieting by itself may not lead to sustained weight loss.
Many studies overestimate the benefits of calorie restriction because the studies confound exercise and diet (testing the effects of diet and exercise as a combined intervention, rather than the effects of diet alone).
Adverse effects
Increased mortality rate
A number of studies have found that intentional weight loss is associated with an increase in mortality in people without weight-related health problems. A 2009 meta-analysis of 26 studies found that "intentional weight loss had a small benefit for individuals classified as unhealthy (with obesity-related risk factors), especially unhealthy obese, but appeared to be associated with slightly increased mortality for healthy individuals, and for those who were overweight but not obese."
Dietary supplements
Due to extreme or unbalanced diets, dietary supplements are sometimes taken in an attempt to replace missing vitamins or minerals. While some supplements could be helpful for people eating an unbalanced diet (if replacing essential nutrients, for example), overdosing on any dietary supplement can cause a range of side effects depending on the supplement and dose that is taken. Supplements should not replace foods that are important to a healthy diet.
Eating disorders
In an editorial for Psychological Medicine, George Hsu concludes that dieting is likely to lead to the development of an eating disorder in the presence of certain risk factors. A 2006 study found that dieting and unhealthy weight-control behaviors were predictive of obesity and eating disorders five years later, with the authors recommending a "shift away from dieting and drastic weight-control measures toward the long-term implementation of healthful eating and physical activity".
Mechanism
When the body is expending more energy than it is consuming (e.g. when exercising), the body's cells rely on internally stored energy sources, such as complex carbohydrates and fats, for energy. The first source to which the body turns is glycogen (by glycogenolysis). Glycogen is a complex carbohydrate, 65% of which is stored in skeletal muscles and the remainder in the liver (totaling about 2,000 kcal in the whole body). It is created from the excess of ingested macronutrients, mainly carbohydrates. When glycogen is nearly depleted, the body begins lipolysis, the mobilization and catabolism of fat stores for energy. In this process fats, obtained from adipose tissue, or fat cells, are broken down into glycerol and fatty acids, which can be used to generate energy. The primary by-products of metabolism are carbon dioxide and water; carbon dioxide is expelled through the respiratory system.
Set-Point Theory
See also: Energy homeostasis § ImbalanceThe Set-Point Theory, first introduced in 1953, postulated that each body has a preprogrammed fixed weight, with regulatory mechanisms to compensate. This theory was quickly adopted and used to explain failures in developing effective and sustained weight loss procedures. A 2019 systematic review of multiple weight change procedures, including alternate day fasting and time-restricted feeding but also exercise and overeating, found systematic "energetic errors" for all these procedures. This shows that the body cannot precisely compensate for errors in energy/calorie intake, countering the Set-Point Theory and potentially explaining both weight loss and weight gain such as obesity. This review was conducted on short-term studies, therefore such a mechanism cannot be excluded in the long term, as evidence is currently lacking on this timeframe.
Methods
Meal timing
A meal timing schedule is known to be an important factor of any diet. Recent evidence suggest that new scheduling strategies, such as intermittent fasting or skipping meals, and strategically placed snacks before meals, may be recommendable to reduce cardiovascular risks as part of a broader lifestyle and dietary change.
Food diary
A 2008 study published in the American Journal of Preventive Medicine showed that dieters who kept a daily food diary (or diet journal), lost twice as much weight as those who did not keep a food log, suggesting that if a person records their eating, they are more aware of what they consume and therefore eat fewer calories.
Water
Main article: Weight loss effects of waterA 2009 review found limited evidence suggesting that encouraging water consumption and substituting energy-free beverages for energy-containing beverages (i.e., reducing caloric intake) may facilitate weight management. A 2009 article found that drinking 500 ml of water prior to meals for a 12-week period resulted in increased long-term weight reduction. (References given in main article.)
Society
It is estimated that about 1 out of 3 Americans is dieting at any given time. 85% of dieters are women. Approximately sixty billion dollars are spent every year in the USA on diet products, including "diet foods", such as light sodas, gym memberships or specific regimes. 80% of dieters start by themselves, whereas 20% see a professional or join a paid program. The typical dieter attempts 4 tries per year.
Weight loss groups
Some weight loss groups aim to make money, others work as charities. The former include Weight Watchers and Peertrainer. The latter include Overeaters Anonymous, TOPS Club and groups run by local organizations.
These organizations' customs and practices differ widely. Some groups are modelled on twelve-step programs, while others are quite informal. Some groups advocate certain prepared foods or special menus, while others train dieters to make healthy choices from restaurant menus and while grocery-shopping and cooking.
Attending group meetings for weight reduction programmes rather than receiving one-on-one support may increase the likelihood that obese people will lose weight. Those who participated in groups had more treatment time and were more likely to lose enough weight to improve their health. Study authors suggested that one explanation for the difference is that group participants spent more time with the clinician (or whoever delivered the programme) than those receiving one-on-one support.
See also
- Body image
- Carbon footprint
- Dietary Guidelines for Americans
- Food faddism
- High residue diet
- Intuitive eating
- List of diets
- National Weight Control Registry
- Nutrigenomics
- Nutrition psychology
- Nutrition scale
- Nutritional rating systems
- Online weight loss plans
- Superfood
- Table of food nutrients
- Underweight
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Further reading
- American Dietetic Association (June 2003). "Position of the American Dietetic Association and Dietitians of Canada: Vegetarian diets". Journal of the American Dietetic Association. 103 (6): 748–765. doi:10.1053/jada.2003.50142. PMID 12778049.
- Cheraskin E (1993). "The Breakfast/Lunch/Dinner Ritual". Journal of Orthomolecular Medicine. 8 (1).
- Dansinger ML, Gleason JL, Griffith JL, Li WJ, Selker HP, Schaefer EJ (12 November 2003). One Year Effectiveness of the Atkins, Ornish, Weight Watchers, and Zone Diets in Decreasing Body Weight and Heart Disease Risk. American Heart Association Scientific Sessions. Orlando, Florida.
- Schwartz, Hillel. Never Satisfied: A Cultural History of Diets, Fantasies, and Fat. New York: Free Press/Macmillan, 1986.
External links
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