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Nature of the diet

The Atkins Diet represents a radical departure from prevailing theories. Atkins claimed there are two main unrecognized factors about Western eating habits, arguing firstly that the main cause of obesity is eating refined carbohydrates particularly sugar, flour, and high-fructose corn syrups; and secondly, that saturated fat is overrated as a nutritional problem, and that only trans fats from sources such as hydrogenated oils need to be avoided. Consequently, Dr. Atkins rejects the advice of the food pyramid, instead asserting that the tremendous increase in refined carbohydrates is responsible for the rise in metabolic disorders of the 20th century, and that the focus on the detrimental effects of dietary fat has actually contributed to the obesity problem by increasing the proportion of insulin-inducing foods in the diet.

Dr. Atkins argued that many eating disorders are the result of hyperinsulinism, or excessive secretion of insulin which comes through eating too many carbohydrates. According to Dr. Atkins, this causes food cravings and unstable blood sugar levels, which can cause mood swings, depression, and sleeping problems. He claimed that his diet stabilizes insulin and blood sugar levels, eliminating cravings and often reducing appetite.

While most of the emphasis in Atkins is on the diet, nutritional supplements and exercise are considered equally important elements.

Atkins involves restriction of the intake of carbohydrates in order to switch the body's metabolism from burning glucose to burning fat (chiefly, stored fat). This process (called lipolysis) begins when the body enters the state of ketosis as a consequence of running out of carbohydrates to burn. Ketosis is an entirely normal state (eg, between meals or associated with heavy exercise) but can cause troubles (ketoacidosis, most seriously) if prolonged.

Atkins restricts "net carbs", or carbs that have an effect on blood sugar. Net carbohydrates can be calculated from a food source by subtracting sugar alcohols and fiber (which are shown to have a negligible effect on blood sugar levels) from total carbohydrates. Sugar alcohols need to be treated with caution, because while they may be slower to convert to glucose, they can be a significant source of glycemic load and can stall weight loss. Fructose (eg, as found in many industrial sweeteners) also contributes to caloric intake, though outside of the glucose -- insulin control loop.

Preferred foods in all categories are whole, unprocessed foods with a low glycemic load.

Phases

There are four phases of the Atkins diet.

Induction

The Induction phase is the first, and most restrictive, phase of the Atkins Nutritional Approach. It is intended to cause the body to quickly enter a state of ketosis. Carbohydrate intake is limited to 20 net grams per day. The allowed foods include a liberal amount of most meats, up to 4 ounces of aged, hard or soft cheeses, three tablespoons of heavy cream, two cups of salad vegetables, one cup of other low glycemic low carb vegetables. Caffeine and alcoholic beverages are not allowed.

The Induction Phase is usually when many see the most significant weight loss - reports of losses up to six or eight pounds (3 or 4 kg) per week are not uncommon.

Atkins suggests the use of Ketostix, small chemically reactive strips used by diabetics. These let the dieter monitor when they enter the ketosis, or fat burning, phase.

Ongoing weight loss

The Ongoing Weight Loss (OWL) phase of Atkins consists of an increase in carbohydrate intake, but remaining at levels where weight loss occurs. The target daily carbohydrate intake increases each week by 5 grams. A goal in OWL is to find the "Critical Carbohydrate Level for Losing". The OWL phase lasts until weight is within 10 pounds (4.5 kg) of the target weight.

Pre-maintenance

Carbohydrate intake is increased again, and the key goal in this phase is to find the "Critical Carbohydrate Level for Maintenance", this is the maximum number of carbohydrates you can eat each day without gaining weight. This may well be above the level of carbohydrates inducing ketosis. So it is not necessary to maintain ketosis forever.

Lifetime maintenance

This phase is intended to carry on the habits acquired in the previous phases, and avoid the common end-of-diet mindset that can return people to their previous habits and previous weight. Whole, unprocessed food choices are emphasized, with the option to drop back to an earlier phase if you begin to gain weight.

Popularity

The Atkins Nutritional Approach gained widespread popularity in 2003 and 2004. At the height of its popularity one in eleven adults were on the diet . This large following was blamed for large declines in the sales of carb-heavy foods like pasta and rice (sales were down 8.2 and 4.6 percent respectively in 2003 ). The diet's success were even blamed for a decline in Krispy Kreme sales . Trying to capitalize on the "low-carb craze" many companies released special product lines which were low in carbohydrates. Coca-Cola released C2 and Pepsi-Cola created Pepsi Edge, which was scheduled to be discontinued later in 2005 . (These products seem to have been little more than marketing gimmicks designed to capitalize on carb-consciousness. Diet Coke and Diet Pepsi, both of which have been available for decades, contain no carbohydrates.)

When Robert Atkins died from a fatal head injury sustained in a fall on ice in 2003, the nutritional plan suffered from rumors and allegations that he had died from a heart condition brought about because of his weight. On July 31, 2005, the Atkins Nutritional company filed for Chapter 11 bankruptcy protection after the percentage of adults on the diet declined to two percent and sales of Atkins brand product fell steeply in the second half of 2004 .

Criticism

An analysis conducted by Forbes magazine found that the Atkins Nutritional Approach (the boxed retail food product created by Atkins to facilitate the Atkins diet) is one of the five most expensive diet plans of the ten plans Forbes analyzed. Although Forbes found that Atkins diet was significantly less expensive than Jenny Craig and only slightly more expensive than Weight Watchers, the Atkins diet nevertheless involved more than an 80% premium over average American food expenses.

Low-carbohydrate diets have been the subject of heated debate in medical circles for three decades . They are still controversial and only recently has any serious research supported some aspects of Atkins' claims, especially for short-term weight-loss (6 months or less).

But many in the scientific community also raise serious concerns:

• The National Weight Control Registry, funded by the National Institutes of Health (NIH) tracked the habits of successful dieters over a longer term, 10 years. Despite this diet's overwhelming popularity compared to other diets, of the 5,000 Americans confirmed to have lost an average of 70 pounds (32 kg) and able to prove they have kept it off for at least 6 years of the decade of NIH’s data-keeping, less than 1% were confirmed to be Atkins adherents. However, of the remaining participants, many other diets were also unable to be confirmed (Wyatt HR and others. Long term weight loss and very low carbohydrate diets in the National Weight Control Registry. Obesity Research 8 (suppl 1):87S., 2000.)

• A 2001 scientific review by Obesity Research magazine concluded that low-carb dieters' initial advantage in weight loss was a result of increased water loss, and that after the initial period, low-carb diets produce similar fat loss to other diets with similar caloric intake.

• Even in studies only one year long, this diet can fail to produce the greater weight-loss which is claimed to come from factors other than calorie-reduction such as ketosis: It was compared to dieters on the Ornish Diet, Weight Watchers, and The Zone diet for 1 year. The Atkins Diet came last in terms of weight lost at the end of the year. (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 12 November 2003 in Orlando, Florida.)

• The May 2004 Annals of Internal Medicine study showed that Atkins Dieters had significantly more diarrhea, general weakness, rashes and muscle cramps. Atkins.com now suggests a fiber supplement.

• Also, acidity from the typically high protein intake can cause Osteoporosis (Feskanich D, Willett WC, Stampfer MJ, Colditz GA. Milk, dietary calcium, and bone fractures in women: a 12-year prospective study. Amer Jrnl Public Health 1997;87:992-7. See also follow-up in February, 2003 issue of the American Journal of Clinical Nutrition (Vol. 77, No. 2, 504-511); this includes 72,000+ people and 18 years of data. Cumming RG, Klineberg RJ. Case-control study of risk factors for hip fractures in the elderly. Amer Jrnl Epidemiology 1994;139:493-503.

Opponents of the diet also point out that the initial weight loss upon starting the diet is a phenomenon common with most diets, and is due to reduction in stored glycogen and related water in muscles, not fat loss. They claim that no evidence has surfaced that any diet will cause weight loss unless it reduces food energy below the maintenance level, and reports have indicated that successful weight loss due to the Atkins diet may be the result of less food energy being consumed by the dieter, rather than the lack of carbohydrates. They further point out that weight loss on fad diets, which typically restrict or prohibit certain foods, is often due to the fact that the dieter has less food choices available. Also, a diet of low-carb foods may quickly become dull to many people, meaning that their appetite is somewhat naturally suppressed as they become hungry for carbs, but the dieter either has none handy or resists this hunger.

It is claimed that there is bad breath and fatigue under the Atkins diet: , , and Cleveland Clinic Journal of Medicine 68(2001): p.761

On May 27, 2004, Jody Gorran, a 53-year-old Florida businessman with a family history of heart disease, filed a lawsuit against Atkins Nutritionals, Inc. and the estate of Dr. Robert Atkins, claiming that the Atkins diet regimen caused severe heart disease, making it necessary for him to undergo angioplasty. As of 28 May, he has been seeking a court injunction banning Atkins Nutritionals from marketing its products without a warning of potential health risks, and asking for compensatory damages.

Dr. Robert Eckel of the American Heart Association says that high-protein, low-carbohydrate diets put people at risk for heart disease.

The Physicians Committee for Responsible Medicine, a PETA-connected organization which is opposed to the Atkins diet, has noted that in East Asian countries such as Thailand or Japan, the average person's diet consists of mainly carbohydrates such as rice and noodles, yet these groups have very low rates of obesity. The average Asian person is also thinner and slimmer than the average Westerner. This example seems to contradict the Atkin's claim that low-carbohydrate diets help to lose weight.

Views in favor of the diet

When the Atkins diet was introduced in the 1970s, it was immediately attacked by existing experts, who claimed it was unhealthy and would fail. Some short-term studies indicate the contrary or indicate that the long-term safety needs more research:

• "The low-carbohydrate diet produced a greater weight loss for the first six months, but the differences were not significant at one year. The low-carbohydrate diet was associated with a greater improvement in some risk factors for coronary heart disease. Adherence was poor and attrition was high in both groups. Longer and larger studies are required to determine the long-term safety and efficacy of low-carbohydrate, high-protein, high-fat diets." --New England Journal Of Medicine, Volume 348:2082-2090, 22 May 2003, Number 21
• "better participant retention and greater weight loss...greater decreases in serum triglyceride levels" --Annals Of Internal Medicine, 18 May 2004 | Volume 140 Issue 10 | Pages 769-777(Journal Editor's note: 'While the study suggests the efficacy and relative safety of the low-cholesterol diet, the high dropout rate, self-directed adherence to the diet, and relatively short observation period challenge the generalizability of the findings.'
• "sustained weight loss " --Atkins funded, non-randomized, non-control intervention trial, American Journal of Medicine, Volume 113, Issue 1, July 2002, Pages 30-36
• "When carbohydrates were restricted , study subjects spontaneously reduced their caloric intake to a level appropriate for their height, did not compensate by eating more protein or fat, and lost weight. We concluded that excessive overeating had been fueled by carbohydrates." "In addition to the calorie reduction and weight loss, subjects experienced markedly improved glucose levels and insulin sensitivity, as well as lower triglycerides and cholesterol." This is not a controlled study in that there was no control group; it merely observed the effect of putting ten obese diabetics on the Atkins diet; this is "the only study of the Atkins diet to have been conducted in the strictly controlled environment of a clinical research center where every calorie eaten and spent was measured." --Annals of Internal Medicine, 15 March 2005

Two of these represent scientifically controlled studies, published in peer-reviewed journals. It should be noted, however, that the number of participants was tiny with less than 100 people completing each study. They were also short at 6 months and 1 year respectively. To date no long term study on Atkins has taken place.

Proponents of the Atkins diet feel much of the criticism leveled at the diet comes from statements and opinions of individuals and associations, rather than from controlled and reviewed studies. Advocates of the diet dispute criticisms based on the fact that a low-carb diet is likely to be high-fat and allegations that fat, especially saturated fat, is harmful. Atkins backers maintain that, aside from trans fat, saturated fat is not harmful. Proponents cite Gary Taubes who, in a 2001 article in Science, 291 (5513): 2536, claims that the oft-cited "consensus" opinion against saturated fats derives from political rather than scientific motives.

Critics of the Atkins diet may focus particularly on Atkins, or on low-carb dieting in general. Proponents claim that critics fail to consider that people are built differently, and as with any diet, the Atkins may not be effective for some people.

Continuing research supports the idea that saturated fat may be cardio-protective in some populations, see http://www.ajcn.org/cgi/content/abstract/80/5/1175, "Dietary fats, carbohydrate, and progression of coronary atherosclerosis in postmenopausal women" and http://www.ajcn.org/cgi/content/full/80/5/1102 , "Saturated fat prevents coronary artery disease? An American paradox."

The 22 May 2003, issue of the New England Journal of Medicine published two scientific, randomized studies comparing standard low-fat diets to low-carbohydrate diets such as the Atkins Diet. In both studies, subjects lost more weight on the low-carbohydrate plans at 6-months but not at 1-year. The editors noted that "Adherence was poor and attrition was high in both groups. Longer and larger studies are required to determine the long-term safety and efficacy of low-carbohydrate, high-protein, high-fat diets."

A research study carried out by the Weight and Eating Disorders Program at the University of Pennsylvania, reported in May 2003 that the Atkins diet raised levels of HDL (or "good") cholesterol by an average of 11% and reduced the amount of triglycerides in the bloodstream by 17%. This counters one of the chief criticisms of Atkins' approach, which is that cholesterol is raised by eating fatty foods and meat.

In another study, conventional dieters' HDL cholesterol raised by 1.6% while their triglyceride levels improved. Weight loss was also statistically greater in the Atkins dieters after three and six months compared with the conventional dieters (although this did not remain statistically significant after a year). The study followed the diets of 63 obese men and women. (See New Scientist, 21 May 2003.)

In conclusion, although a small number of short-term studies have been carried out, that indicate that Atkins-style diet may help dieters achieve comparable weight loss with other dieting methods, no long term study has yet to be carried out. Thus the long term effects of Atkins on health remains unknown, and the results of these studies indicates the effectiveness of the diet for losing weight is no better.

Misconceptions about the diet

Many people incorrectly believe that the Atkins Diet promotes eating unlimited amounts of fatty meats and cheeses. In fact, while certain foods are allowed in unlimited quantities (i.e., are limited only by appetite), the Atkins Diet is very specific in recommending lean meats, such as seafood and poultry. This is a key point of clarification that Dr. Atkins addressed in the more recent revisions of his book.

Some criticism of the diet seems to be based on a confusion between ketosis and ketoacidosis. Ketosis is short for Benign Dietary Ketosis, which is a normal metabolic process that results when glucose is not available as a source of energy. The body then burns mostly fat, both directly and through conversion to ketones which make the energy of fat available in water soluble form. Ketoacidosis is a metabolic crisis due to the inability to utilize glucose because of a lack of insulin and in which there is an abnormal accumulation of ketones exacerbated by severe dehydration as the kidneys spill the useless glucose, losing water in the process. This occurs in diabetics and in a related form in alcoholics.

Another common misconception arises from confusion between the Induction Phase and rest of the diet. The first two weeks of the Atkins Diet are strict, with only 20g of carbohydrates permitted per day. The plan is clear that dieters should not ordinarily continue past the 2-week Induction Phase without slowly raising their daily carbohydrate count. Once the weight-loss goal is reached, carbohydrate levels are raised even further, though still significantly below USDA norms, and still within or slightly above the definition of ketosis.

The Induction Phase is also known for its comparatively lower intake of dietary fiber, and this is often misconstrued as characteristic of the diet as a whole. It is often misstated that those on the diet do not consume enough vegetables and fruits. However those who follow it properly should not face this problem as even the Induction Phase allows for adequate amounts of dark green leafy vegetables, for example.

Books

• Robert C. Atkins (2004) Atkins for Life: The Complete Controlled Carb Program for Permanent Weight Loss and Good Health, 370pp, St. Martin's Press, ISBN 0641678924
• Robert C. Atkins (2001) Dr. Atkins' New Diet Revolution book, 560 pp, Avon Books; Revised ed., ISBN 006001203X, ISBN 0091889480
• Robert C. Atkins (1999) Dr. Atkins' Vita-Nutrient Solution: Nature's Answer to Drugs, 416 pp, Fireside Books (Simon & Schuster), ISBN 0684844885

References

• New England Journal of Medicine: (vol 348, p 2082)
• "What if It's All Been a Big Fat Lie?": By GARY TAUBES, The New York Times, Published: July 7, 2002

See also

• South Beach diet
• Carbwiser
• Diet
• Dieting
• Sugar Busters
• The Low Carb Revolution (TV show about the Atkins diet)
• Paleolithic diet

External links

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• Atkins Corporate Site
• Atkins Diet at the Open Directory Project
• Profiling Food Consumption in America
• Atkins Files For Bankruptcy health.dailynewscentral.com