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The Paleolithic diet, Paleo diet, caveman diet, or Stone Age diet is a modern fad diet consisting of foods thought by its proponents to mirror those eaten by humans during the Paleolithic era.: "The Paleolithic diet has been gaining ground in the field of fad diets. It is based on food patterns of human Paleolithic ancestors, about 2.6 million to 10,000 years ago, a period that precedes the advent of industrial agriculture and is different from today's modern society".
The diet avoids food processing and typically includes vegetables, fruits, nuts, Root vegetable, and meat and excludes dairy products, grains, sugar, legumes, processed , salt, alcohol, and coffee. - "The Paleo diet (also known as the Paleolithic Diet, the Caveman diet and the Stone Age Diet) is a diet where only foods presumed to be available to Neanderthals in the prehistoric era are consumed and all other foods, such as dairy products, grains, sugar, legumes, 'processed' oils, salt, and others like alcohol or coffee are excluded." Historians can trace the ideas behind the diet to "primitive" diets advocated in the 19th century. In the 1970s, Walter L. Voegtlin popularized a meat-centric "Stone Age" diet; in the 21st century, the best-selling books of Loren Cordain popularized the "Paleo diet".; ; . the Paleolithic diet industry was worth approximately million..
In the 21st century, the sequencing of the human genome and DNA analysis of the remains of anatomically modern humans have found evidence that Human evolution rapidly in response to changing diet. This evidence undermines a core premise of the Paleolithic diet—that human digestion has remained essentially unchanged over time.; : "No one ... can legitimately claim to have found the only 'natural' diet for humans. We simply ate too many different foods in the past, and have adapted to new ones". Paleoanthropological evidence has indicated that prehistoric humans ate plant-heavy diets that regularly included grains and other starchy vegetables, in contrast to the claims made by proponents of the Paleolithic diet.
Advocates promote the Paleolithic diet as a way of improving health.. There is some evidence that following it may lead to improvements in body composition and metabolism compared with the typical Western diet. or compared with diets recommended by some European nutritional guidelines.. On the other hand, following the diet can lead to nutritional deficiencies, such as an inadequate calcium intake, and side effects can include weakness, diarrhea, and . For calcium deficicency see ; for other risks see .
In his 1975 book The Stone Age Diet, gastroenterologist Walter L. Voegtlin advocated a meat-based diet, with low proportions of vegetables and starchy foods, based on his declaration that humans were "exclusively flesh-eaters" until 10,000 years ago..
In 1985 Stanley Boyd Eaton and Melvin Konner published a controversial article in the New England Journal of Medicine proposing that modern humans were biologically very similar to their primitive ancestors and so "genetically programmed" to consume pre-agricultural foods. Eaton and Konner proposed a "discordance hypothesis" by which the mismatch between modern diet and human biology gave rise to lifestyle diseases, such as obesity and diabetes..
The diet started to become popular in the 21st century, where it attracted a largely internet-based following using web sites, forums and social media..
This diet's ideas were further popularized by Loren Cordain, a health scientist with a Ph.D. in physical education, who trademarked the words "The Paleo Diet" and who wrote a 2002 book of that title.. For Cordain's qualifications see . For trademarking see .
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 and 2014 the Paleolithic diet was Google's most searched weight-loss method..
The Paleolithic or Paleo diet is also sometimes referred to as the caveman or Stone Age diet..
Foodstuffs that have been described as permissible include:
The diet forbids the consumption of all dairy products. This is because milking did not exist until animals were domesticated after the Paleolithic era.: "No dairy products are allowed while on this diet. This means no milk, cheese, butter, or anything else that comes from milking animals. This is because milking did not occur until animals were domesticated, sometime after the Paleolithic age. Eggs are allowed however, because Paleolithic man would probably have found eggs in bird's nests during foraging and hunting."
The data for Cordain's book 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 diet.; ; . 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 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 Paleolithic 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.; .
Following the Paleolithic diet results in the consumption of fewer processed foods, less sugar, and less salt. Reduced consumption of these elements is consistent with mainstream advice about diet.. Diets with a Paleolithic nutrition pattern also share some similarities with traditional ethnic diets, such as the Mediterranean diet, which have been found to result in greater health benefits than the Western diet.; . Following the paleolithic diet can lead to nutritional deficiencies, such as those of vitaminD and calcium, which can in turn lead to compromised bone health.; . The increased fish consumption suggested by the diet can also lead to an elevated risk of exposure to toxins..
There is some evidence that the diet can help in achieving weight loss, due to the increased satiety from the foods typically eaten.. 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 these participants included "weakness, diarrhea, and headaches". As with any other diet regime, the Paleolithic diet leads to weight loss because of overall decreased caloric deficit, rather than any specific feature of the diet itself..
There is no good evidence that following a Paleolithic diet reduces the risk of cardiovascular disease or metabolic syndrome,; . nor is there any evidence that the Paleolithic diet is effective in treating inflammatory bowel disease.: "Even less evidence exists for the efficacy of the SCD, FODMAP, or Paleo diets. Furthermore, the practicality of maintaining these interventions over long periods of time is doubtful."
The Paleolithic diet is similar to the Atkins diet, in that it encourages the consumption of large amounts of red meat, especially meats high in saturated fat. Increased consumption of red meat can lead to a higher incidence of cardiovascular disease..
The argument is that modern humans have not been able to adapt to the new circumstances.. According to Cordain, before the agricultural revolution, hunter-gatherer diets rarely included grains, and obtaining milk from wild animals would have been "nearly impossible". Advocates of the diet argue that the increase in diseases of affluence after the dawn of agriculture was caused by these 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..
According to the model from the evolutionary discordance hypothesis, "many and degenerative conditions evident in modern Western culture 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.. Lactase persistence, which confers lactose tolerance into adulthood, 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..
Since the publication of Eaton and Konner's paper in 1985, analysis of the DNA of primitive human remains has provided evidence that evolving humans were continually adapting to new diets, thus challenging the hypothesis underlying the Paleolithic diet.. 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"..
Paleoanthropologist Peter Ungar has written that the paleo diet is a "myth", on account both of its invocation of a single suitable diet when in reality humans have always been a "work in progress", and because diet has always been varied because humans were spread widely over the planet..
Anthropological geneticist Anne C. Stone has said that humans have adapted in the last 10,000 years in response to radical changes in diet. In 2016, she was quoted as saying "It drives me crazy when Paleo-diet people say that we've stopped evolving—we haven't"..
Melvin Konner has said the challenge to the hypothesis is not greatly significant since the real challenges to human non-adaptation have occurred with the rise of ever-more refined foodstuffs in the last 300 years..
Elizabeth Kolbert has written the Paleolithic diet's emphasis on meat consumption is a "disaster" on account of meat's comparatively high energy production costs..
the market for products with the word "Paleo" in their name was worth approximately $US500 million, with strong growth prospects despite pushback from the scientific community. Some products were taking advantage of the trend by touting themselves as "paleo-approved" despite having no apparent link to the movement's tenets..
Like many other diets, the Paleolithic 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 paleolithic diet, is controlled by a malign food industry.; ; : "Fad diets and 'miracle' diet supplements promise to help us lose weight effortlessly. Different diet gurus offer a bewildering array of diets that promise to keep us healthy and make us live longer: vegan, Paleo, Mediterranean, low fat, low carb, raw food, gluten-free ... the list goes on." Paleolithic diet advocate John Durant has blamed suppression of the truth about diet in the United States on "the vegetarian lobby"..
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