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The Paleolithic diet, Paleo diet, caveman diet, or stone-age diet is a modern fad diet requiring the sole or predominant eating of foods presumed to have been available to humans during the Paleolithic era.

While there is wide variability in the way the paleo diet is interpreted, the diet typically includes vegetables, fruits, nuts, roots, and meat and typically excludes foods such as dairy products, grains, sugar, legumes, processed oils, salt, alcohol, and coffee. The diet is based on avoiding not just processed foods, but rather the foods that humans began eating after the Neolithic Revolution when humans transitioned from hunter-gatherer lifestyles to settled agriculture. The ideas behind the diet can be traced to Walter L. Voegtlin during the 1970s. In the 21st century, the paleo diet was popularized in the best-selling books of Loren Cordain.

The digestive abilities of anatomically modern humans are different from those of pre-Homo sapiens humans, which undermines the diet's core premise. During the 2.6 million year-long Paleolithic era, the highly variable climate and worldwide spread of human populations meant that humans were, by necessity, nutritionally adaptable. Supporters of the diet mistakenly assume that human digestion has remained essentially unchanged over time.

The paleo diet is promoted as a way of improving health. There is some evidence that following this diet may lead to improvements in terms of body composition and metabolic effects compared with the typical Western diet or compared with diets recommended by national nutritional guidelines. Following the paleo diet can lead to nutritional deficiencies such as an inadequate calcium intake, and side effects can include weakness, diarrhea, and headaches.

History and terminology

According to Adrienne Rose Johnson, the idea that the primitive diet was superior to current dietary habits dates back to the 1890s with such writers as Emmet Densmore and John Harvey Kellogg. Densmore proclaimed that "bread is the staff of death", while Kellogg supported a diet of starchy and grain-based foods. Arnold DeVries advocated an early version of the Paleolithic diet in his 1952 book, Primitive Man and His Food. In 1958, Richard Mackarness authored Eat Fat and Grow Slim, which proposed a low-carbohydrate "Stone Age" diet.

The idea of a Paleolithic diet can also be traced to a 1975 book by gastroenterologist Walter L. Voegtlin, which in 1985 was further developed by Stanley Boyd Eaton and Melvin Konner, and popularized by Loren Cordain in his 2002 book The Paleo Diet. The terms caveman diet and stone-age diet are also used, as is Paleo Diet, trademarked by Cordain.

In 2012 the Paleolithic diet was described as being one of the "latest trends" in diets, based on the popularity of diet books about it; in 2013 the Paleolithic diet was Google's most searched weight-loss method.

Like many other diets, the paleo diet is promoted by some by an appeal to nature and a narrative of conspiracy theories about how nutritional research, which does not support the supposed benefits of the paleo diet, is controlled by a malign food industry. A Paleo lifestyle and ideology have developed around the diet.

Foods

The diet advises eating only foods presumed to be available to Paleolithic humans, but there is wide variability in people's understanding of what foods these were, and an accompanying ongoing debate. The diet is based on avoiding not just modern processed foods, but also the foods that humans began eating after the Neolithic Revolution.

The scientific literature generally uses the term "Paleo nutrition pattern", which has been variously described as:

• "vegetables, fruits, nuts, roots, meat, and organ meats";
• "vegetables (including root vegetables), fruit (including fruit oils, e.g., olive oil, coconut oil, and palm oil), nuts, fish, meat, and eggs, and it excluded dairy, grain-based foods, legumes, extra sugar, and nutritional products of industry (including refined fats and refined carbohydrates)"; and
• "avoids processed foods, and emphasizes eating vegetables, fruits, nuts and seeds, eggs, and lean meats".

The diet forbids the consumption of all dairy products. This is because milking did not exist until animals were domesticated after the Paleolithic era.

Health effects

The Paleo diet is strongly advocated by its proponents for claimed health benefits for which there is no good evidence. In general, research into the paleo diet has been of poor quality.

The aspects of the paleo diet that result in eating fewer processed foods and less sugar and salt are consistent with mainstream advice about diet. Diets with a paleo nutrition pattern have some similarities to traditional ethnic diets such as the Mediterranean diet that have been found to be healthier than the Western diet. Following the paleo diet, however, can lead to nutritional deficiencies such as those of vitamin D and calcium, which in turn could lead to compromised bone health; it can also lead to an increased risk of ingesting toxins from high fish consumption.

Research into the weight loss effects of the paleolithic diet has generally been of poor quality. One trial of obese postmenopausal women found improvements in weight and fat loss after six months, but the benefits had ceased by 24 months; side effects among participants included "weakness, diarrhea, and headaches". As with any other diet regime, the paleo diet leads to weight loss because of overall decreased caloric intake, rather than a special feature of the diet itself.

These preliminary trials have found that participants eating a paleo nutrition pattern had better measures of cardiovascular and metabolic health than people eating a standard diet, though the evidence is not strong enough to recommend the paleo diet for treatment of metabolic syndrome. As of 2014 there was no evidence the paleo diet is effective in treating inflammatory bowel disease.

The paleolithic diet similar to the Atkins diet encourages the consumption of large amounts of red meat, especially meats high in saturated fat. This has a negative effect on health in the long run as medical studies have shown that it can lead to increased incidence of cardiovascular disease.

Rationale and counter-arguments

Adaptation

The rationale for the Paleolithic diet derives from proponents' claims relating to evolutionary medicine. Advocates of the diet state that humans were genetically adapted to eating specifically those foods that were readily available to them in their local environments. These foods therefore shaped the nutritional needs of Paleolithic humans. They argue that the physiology and metabolism of modern humans have changed little since the Paleolithic era. Natural selection is a long process, and the cultural and lifestyle changes introduced by western culture have occurred quickly. The argument is that modern humans have therefore not been able to adapt to the new circumstances. The agricultural revolution brought the addition of grains and dairy to the diet.

According to the model from the evolutionary discordance hypothesis, "many chronic diseases and degenerative conditions evident in modern Western populations have arisen because of a mismatch between Stone Age genes and modern lifestyles." Advocates of the modern paleo diet have formed their dietary recommendations based on this hypothesis. They argue that modern humans should follow a diet that is nutritionally closer to that of their Paleolithic ancestors.

The evolutionary discordance is incomplete, since it is based mainly on the genetic understanding of the human diet and a unique model of human ancestral diets, without taking into account the flexibility and variability of the human dietary behaviors over time. Studies of a variety of populations around the world show that humans can live healthily with a wide variety of diets and that humans have evolved to be flexible eaters. Lactose tolerance is an example of how some humans have adapted to the introduction of dairy into their diet. While the introduction of grains, dairy, and legumes during the Neolithic revolution may have had some adverse effects on modern humans, if humans had not been nutritionally adaptable, these technological developments would have been dropped.

Evolutionary biologist Marlene Zuk writes that the idea that our genetic makeup today matches that of our ancestors is misconceived, and that in debate Cordain was "taken aback" when told that 10,000 years was "plenty of time" for an evolutionary change in human digestive abilities to have taken place. On this basis Zuk dismisses Cordain's claim that the paleo diet is "the one and only diet that fits our genetic makeup".

Diseases of affluence

Advocates of the diet argue that the increase in diseases of affluence after the dawn of agriculture was caused by changes in diet, but others have countered that it may be that pre-agricultural hunter-gatherers did not suffer from the diseases of affluence because they did not live long enough to develop them. Based on the data from hunter-gatherer populations still in existence, it is estimated that at age 15, life expectancy was an additional 39 years, for a total expected age of 54 years. At age 45, it is estimated that average life expectancy was an additional 19 years, for a total expected age of 64 years. That is to say, in such societies, most deaths occurred in childhood or young adulthood; thus, the population of elderly – and the prevalence of diseases of affluence – was much reduced. Excessive food energy intake relative to energy expended, rather than the consumption of specific foods, is more likely to underlie the diseases of affluence. "The health concerns of the industrial world, where calorie-packed foods are readily available, stem not from deviations from a specific diet but from an imbalance between the energy humans consume and the energy humans spend."

Historical diet

Adoption of the Paleolithic diet assumes that modern humans can reproduce the hunter-gatherer diet. Molecular biologist Marion Nestle argues that "knowledge of the relative proportions of animal and plant foods in the diets of early humans is circumstantial, incomplete, and debatable and that there are insufficient data to identify the composition of a genetically determined optimal diet. The evidence related to Paleolithic diets is best interpreted as supporting the idea that diets based largely on plant foods promote health and longevity, at least under conditions of food abundance and physical activity." Ideas about Paleolithic diet and nutrition are at best hypothetical.

The data for Cordain's book only came from six contemporary hunter-gatherer groups, mainly living in marginal habitats. One of the studies was on the !Kung, whose diet was recorded for a single month, and one was on the Inuit. Due to these limitations, the book has been criticized as painting an incomplete picture of the diets of Paleolithic humans. It has been noted that the rationale for the diet does not adequately account for the fact that, due to the pressures of artificial selection, most modern domesticated plants and animals differ drastically from their Paleolithic ancestors; likewise, their nutritional profiles are very different from their ancient counterparts. For example, wild almonds produce potentially fatal levels of cyanide, but this trait has been bred out of domesticated varieties using artificial selection. Many vegetables, such as broccoli, did not exist in the Paleolithic period; broccoli, cabbage, cauliflower, and kale are modern cultivars of the ancient species Brassica oleracea.

Trying to devise an ideal diet by studying contemporary hunter-gatherers is difficult because of the great disparities that exist; for example, the animal-derived calorie percentage ranges from 25% for the Gwi people of southern Africa to 99% for the Alaskan Nunamiut. Descendants of populations with different diets have different genetic adaptations to those diets, such as the ability to digest sugars from starchy foods. Modern hunter-gatherers tend to exercise considerably more than modern office workers, protecting them from heart disease and diabetes, though highly processed modern foods also contribute to diabetes when those populations move into cities.

A 2018 review of the diet of hunter-gatherer populations found that the dietary provisions of the palelothic diet had been based on questionable research, and were "difficult to reconcile with more detailed ethnographic and nutritional studies of hunter-gatherer diet".

Researchers have proposed that cooked starches met the energy demands of an increasing brain size, based on variations in the copy number of genes encoding amylase.

                                        Paleo Diet Benefits

Paleo Diet Also called the caveman diet or the stone-age diet is a diet based on the foods that have been eaten by early humans. A paleo diet is a diet plan based on foods similar to the Paleolithic era, which dates from approximately 2.5 million to 10,000 years ago. This diet is high in protein, which is an important nutrient for build and maintaining muscle. But too much protein intake usually means too little carbohydrate, which is the energy source for exercise. Paleo diet will help those who want to lose weight or maintain a healthy weight. What to eat Fish, especially those rich in omega-3 fatty acids, such as salmon, mackerel and albacore tuna Oils from fruits and nuts, such as olive oil or walnut oil Fruits Vegetables Nuts and seeds Lean meats, especially grass-fed animals or wild game

What to avoid Refined sugar Salt Potatoes Highly processed foods in general Grains, such as wheat, oats, and barley Legumes, such as beans, lentils, peanuts and peas Dairy products Benefits of Paleo Diet

Balances Blood Glucose Levels Because you are avoiding refined sugar, it's easier to avoid the rise in your blood glucose level.

Leaner Muscles This diet plan relies heavily on the meat you'll be getting a fair amount of protein to give your muscles. This diet can help you promote a leaner physique, and even help with muscle growth. Keeps You Feeling Fuller Longer Many diets keep you in a constant state of hunger but this diet is different, this will give you focused on feeling full and feeling good which means it's easier to follow. No counting Requires Unlike other diets, this diet will not let you count on how much you've eaten in a day. This diet is very simple and easy to follow. Help You Sleep Better By cutting out processed foods, chemicals and additives will be automatically cut. Cutting additives and chemicals on your foods will naturally get tired of your body at night. Cuts Out Empty Carbs and Calories Sugary beverages and sodas are out in doing the Paleo diet. Cutting these drinks will naturally lose your weight, feeling better, and give you more sustained energy. Gives You More Energy When you combine paleo-approved foods in the right way, you're getting a well-balanced meal with vegetable, protein, and carb. You are it all from-natural resources. This is the way to feel more energized.

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Further reading

• Bijlefeld M, Zoumbaris SK (2014). "Paleo Diet". Encyclopedia of Diet Fads: Understanding Science and Society (2nd ed.). ABC-CLIO. pp. 164–166. ISBN 978-1-61069-760-6.
• Gorski D (18 March 2013). "It's a part of my paleo fantasy, it's a part of my paleo dream". Science-Based Medicine. Retrieved 1 February 2015.

External links

• Human Timeline (Interactive) – Smithsonian, National Museum of Natural History (August 2016).
• Debunking the paleo diet on YouTube, TEDx talk by anthropologist Christina Warinner

• Diets
• Fad diets
• Meat-based diets
• Raw foodism
• Pseudoscience