The Paleolithic diet, also popularly referred to as the caveman diet, Stone Age diet and hunter-gatherer diet, is a modern nutritional diet designed to emulate, insofar as possible using modern foods, the diet of wild plants and animals eaten by humans during the Paleolithic era. Proponents of the diet therefore recommend avoiding any foods that are thought not to have been available to humans at that time, including dairy products, grains, legumes, processed oils, and refined sugar. The Paleolithic diet is a fad diet that became popular in the late 2000s.
The diet is based on several premises. Proponents of the diet posit that during the Paleolithic era — a period lasting around 2.5 million years that ended about 10,000 years ago with the advent of agriculture and domestication of animals — humans evolved nutritional needs specific to the foods available at that time, and that the nutritional needs of modern humans remain best adapted to the diet of their Paleolithic ancestors. Proponents also claim that human metabolism has been unable to adapt fast enough to handle many of the foods that have become available since the advent of agriculture. Thus, modern humans are said to be maladapted to eating foods such as grain, legumes, and dairy, and in particular the high-calorie processed foods that are a staple part of most modern diets. Proponents claim that it is modern humans' inability to digest properly these comparatively new types of food that has led to modern-day problems such as obesity, heart disease, and diabetes. Conversely, it is claimed that followers of the Paleolithic diet may enjoy a longer, healthier, more active life.
Critics of the Paleolithic diet have pointed out a number of flaws with its underlying logic, including the fact that humans are much more nutritionally flexible than previously thought, that the hypothesis that Paleolithic humans were genetically adapted to specific local diets remains to be proven, that the Paleolithic period was extremely long and saw a variety of forms of human settlement and subsistence in a wide variety of changing nutritional landscapes, and that currently very little is known for certain about what Paleolithic humans ate. Nutritionists have stated that the diet may be less effective than other popular diets in promoting good health.
- 1 History
- 2 Rationale for the diet
- 3 The diet
- 4 Reception
- 5 See also
- 6 References
An early book on the topic was The Stone Age Diet, self-published in 1975 by Walter Voegtlin. In 1985, Boyd Eaton and Melvin Konner published a paper on Paleolithic nutrition in the New England Journal of Medicine followed in 1988 by the book, with Marjorie Shostak, The Paleolithic Prescription. Since the late 1990s many others have published books and articles promoting the diet, including Staffan Lindeberg, Mark Sisson, and Arthur De Vany.
The diet was overshadowed by regimens such as the Atkins diet and South Beach Diet until the publication of a popular book by Loren Cordain. Cordain holds a bachelor degree in health science, a masters and doctoral degree in exercise physiology, and has studied nutrition professionally for over twenty years. His web site styles him as "Dr Loren Cordain, world's leading expert on paleolithic diets and founder of The Paleo Movement". He is the owner of the trademark "The Paleo Diet". The paleolithic diet has grown greatly in popularity since the publication of Cordain's book, and in 2013 was Google’s most searched-for weight loss method.
Rationale for the diet
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The rationale for the Paleolithic diet derives from a popular tenet in evolutionary medicine known as the evolutionary discordance hypothesis, a hypothesis first articulated by Eaton and Konner in their 1985 article "Paleolithic Nutrition: A Consideration of Its Nature and Current Implications". The evolutionary discordance hypothesis states that "many chronic diseases and degenerative conditions evident in modern Western populations have arisen because of a mismatch between Stone Age genes and recently adopted lifestyles." The hypothesis takes a specific form with regard to diet and nutrition, and, in this form, includes the following claims and arguments:
- Paleolithic humans were genetically adapted to eating specifically those foods that were readily available to them in their local environments (termed environments of evolutionary adaptedness, or EEAs, by researchers in the field of evolutionary medicine). These foods therefore shaped the nutritional needs of Paleolithic humans. A necessary implication of this assumption is that Paleolithic humans were not adapted (maladapted) to eating foods other than those readily available to them.
- Eating those foods to which Paleolithic humans were specifically adapted conferred upon them relative health and longevity, and precluded the possibility (or at least lowered the risk) of their contracting diseases like obesity, atherosclerosis, pulmonary disease, type 2 diabetes, certain types of cancer, and dental cavities. A necessary implication of this assumption is that eating foods to which Paleolithic humans were maladapted resulted in ill health and heightened rates of disease.
- Most Paleolithic communities were organized around some form of hunter-gatherer or forager-gather subsistence, which implies that they regularly ate wild plants and root vegetables, fruits and nuts, and the considerable quantities of the flesh of wild animals (including fish and shellfish). They did not eat (because they could not cultivate in large enough quantity) legumes, grains, salt, the milk of other animals, and large quantities of animal fat.
- The physiology and metabolism of modern humans have changed little, if at all, since the time of their Paleolithic ancestors.
- Because of (1) and (4), modern humans remain genetically adapted to the diet of their Paleolithic ancestors, and genetically maladapted to foods not eaten by their these ancestors.
- The advent of agriculture and industrialization has led to the availability of foods to which humans are not genetically adapted, and these detrimental foods (particularly carbohydrate-rich starches like wheat and maize) have now largely replaced beneficial foods (like lean animal protein) in human diets.
- Diseases of affluence and lifestyle diseases are modern afflictions that have arisen in part from the eating of foods to which humans are not genetically adapted.
- It is currently possible to discover (through palaeontology, archaeology, and the study of modern hunter-gatherer societies) what the diet of Paleolithic humans consisted of and to reproduce or at least emulate it using foods readily available today.
Advocates of the modern Paleolithic diet, including Loren Cordain, take the evolutionary discordance hypothesis for granted, and form their dietary recommendations on its basis. They argue that modern humans should follow a diet that is as nutritionally close to that of their Paleolithic ancestors as possible. Major advocates of the diet believe that this includes eating:
- Lean meat (should constitute about 45–65% of daily caloric intake)
- Non-starchy vegetables
- Fruits and berries
- No refined sugar (except honey)
- Very little or no dairy food (butter, milk, cheese, yogurt).
- Very little cereal grains (maize, wheat, barley, rice, etc.).
- Very little salt.
Criticism of the rationale
The validity of the core tenet upon which the paleolithic diet relies, the evolutionary discordance hypothesis, has been brought into serious doubt by recent research into the fields of palaeontology, archaeological genetics, biological anthropology, and evolutionary medicine.
The Paleolithic Prescription, a pioneering book on the topic, published in 1988 by S. Boyd Eaton, Melvin Konner, and Marjorie Shostak, attempted to reconstruct a Paleolithic forager diet based on average values from hunter-gatherer diets that were available in the literature. However, the data for the book only came from six 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 Eskimos. Due to these limitations, the book has been criticized as painting an incomplete picture of what the diets of Paleolithic ancestors may have looked like.
It has been noted that the rationale for the diet does not take adequate account of the fact that, due to the pressures of artificial selection, most modern domesticated plants and animals differ drastically from their Paeleolithic ancestors, whose nutritional profiles often differed drastically from their modern counterparts. For example, wild almonds produce potentially fatal levels of cyanide, but this harmful poison has been bred out of domesticated varieties by artificial selection. Moreover, many vegetables like Broccoli "did not ... exist in the Paleolithic period". Broccoli and many other genetically similar vegetables (like cabbage, cauliflower, kale, etc.) are in fact modern cultivars of the ancient species Brassica oleracea, a wild plant also known as wild mustard.
It is often argued that preagricultural foragers did not suffer from the diseases of affluence simply because they did not live long enough to develop them. Based on the data from recent hunter-gatherer populations, it is estimated that at age 15, life expectancy was an additional 39 years, for a total age of 54. At age 45, it is estimated that average life expectancy was an additional 19 years, for a total age of 64 years.
With regard to attempts to emulate the "ideal" 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 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.
Trying to devise an ideal diet by studying contemporary hunter-gatherers is difficult because of the great disparities that exist, for example with the animal-derived calorie percentage ranging from 25% in the Gwi people of southern Africa to 99% in Alaskan Nunamiut.
Food energy excess, relative to energy expended, rather than the consumption of specific foods may underlie the diseases of affluence. Studies of traditionally living populations show that humans can live healthily with a wide variety of diets. We have evolved to be flexible eaters. "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 we consume and the energy we spend."
Recommendations to restrict starchy vegetables may not be an accurate representation of the diet of relevant Paleolithic ancestors. Five recent studies examining the isotope analysis of fossilized tooth enamel from scores of human ancestors and baboons in Africa show that human ancestors expanded their menu 3.5 million years ago, adding C4 tropical grasses and sedges to an ape-like diet. While the consumption of animals grazing on C4 pastures can contribute to C4 isotopic signatures, the magnitude of 13C enrichment—used to infer C3/C4 ratios—in early hominid fossils suggests that the carbon in their diet was derived mainly from C4 plants rather than the tissues of animals grazing on C4 grasses. Very high proportions of animal food are not considered plausible for hominids given that even modern hunter gatherers armed with bows and arrows tend to have dismal hunting success, and hominids lack the appropriate dental morphology of a high meat diet. Expanding on those findings, Oxford University researchers observed that baboons today eat large quantities of starchy C4 tiger nut tubers and the wear patterns on the tooth enamel from these sedge tubers are a perfect match with the wear patterns on the enamel of Paranthropus boisei ('Nutcracker Man')—a hominid, with a high C4 isotopic signature, who lived in East Africa between 2.4 million and 1.4 million years ago. The Oxford University study therefore concluded that Paranthropus boisei survived mainly on a diet of starchy tiger nut tubers. Dr Gabriele Macho, a lead researcher on the study from the School of Archaeology at Oxford University, said "I believe that the theory—that 'Nutcracker Man' lived on large amounts of tiger nuts—helps settle the debate about what our early human ancestor ate. On the basis of recent isotope results, these hominins appear to have survived on a diet of C4 foods, which suggests grasses and sedges. Yet these are not high quality foods. What this research tells us is that hominins were selective about the part of the grass that they ate, choosing the grass bulbs at the base of the grass blade as the mainstay of their diet." Incidentally, tiger nut tubers were among the earliest plants cultivated by humans, including ancient Egyptians and Paleo-Indians. Additionally, recent understanding of the human genome has shown that modern humans typically have many copies of the AMY1 gene for starch digestion—suggesting widespread evolutionary adaptation to starch consumption by humans.
Furthermore, the restriction of starchy plants, by definition, severely limits the dietary intake of microbiota-accessible carbohydrates (MACs) and may negatively affect the micobiome in ways that contribute to disease. Starchy plants, in particular, are a main source of resistant starch — a dietary fiber with strong prebiotic properties. Resistant starches are not digestible by mammals and are fermented and metabolized by gut flora into short chain fatty acids, which are well known to offer a wide range of health benefits. Resistant starch consumption has been shown to improve intestinal/colonic health, blood sugar, glucose tolerance, insulin-sensitivity and satiety. Public health authorities and food organizations such as the Food and Agricultural Organization, the World Health Organization, the British Nutrition Foundation and the U.S. National Academy of Sciences recognize resistant starch as a beneficial carbohydrate. The Joint Food and Agricultural Organization of the United Nations/World Health Organization Expert Consultation on Human Nutrition stated, "One of the major developments in our understanding of the importance of carbohydrates for health in the past twenty years has been the discovery of resistant starch."
Meat, seafood, and other animal products represent the staple foods of modern-day Paleo diets, since advocates claim protein comprises 19-35% of the calories in hunter-gatherer diets. The Centers for Disease Control and Prevention, the national public health institute of the United States, recommends that 10-35% of calories come from protein.
The diet recommends the consumption of non-starchy fresh fruits and vegetables to provide 35-45 % daily calories and be the main source of carbohydrates. According to the United States Department of Agriculture, the acceptable macronutrient distribution range for carbohydrates is 45 to 65 percent of total calories. A typical modern diet gets a lot of carbohydrates from dairy products and grains, but these are excluded in the Paleolithic diet.
High fiber intake not via grains, but via non-starchy vegetables and fruits.
Advocates recommend, relative to modern diets, that the Paleolithic diet have moderate to higher fat intake dominated by monounsaturated and polyunsaturated fats and omega-3 fats, but avoiding trans fats, and omega-6 fats.
It is well known that modern diets are high in salt and many diets, including the Paleolithic, recommend a reduction.
Balanced alkaline vs. acid
Any food presents either a net acid (e.g. meats, fish, grains, legumes, cheese, and salt) or alkaline (e.g. fruits and vegetables) load to the kidneys.
A higher intake of vitamins and minerals is recommended via grass-fed meats, fruits, and vegetables rather than grains.
The Paleolithic diet has lower energy density than the typical diet consumed by modern humans. This is especially true in primarily plant-based/vegetarian versions of the diet, but it still holds if substantial amounts of meat are included. For example, most fruits and berries contain 0.4–0.8 calories per gram, and vegetables can be even lower than that (cucumbers contain only 0.16 calories per gram). Game meat, such as cooked wild rabbit, is more energy-dense (up to 1.7 calories per gram), but it does not constitute the bulk of the diet by mass or volume at the recommended plant/animal ratios, and it does not reach the caloric densities of many processed foods commonly consumed by modern humans.
Consuming foods low in energy density (kcal/g) decreases energy intake over several days, but the effectiveness of this strategy for weight loss has not been tested.
Even some authors who may appear otherwise critical of the Paleolithic diet have argued that the high energy density of modern diets, as compared to ancestral or primate diets, contributes to the incidence of diseases of affluence in the industrial world.
Fish and seafood represent a particularly rich source of omega-3 fatty acids and other micronutrients, such as iodine, iron, zinc, copper, and selenium, that are crucial for proper brain function and development. Terrestrial animal foods, such as muscle, brain, bone marrow, thyroid gland, and other organs, also represent a primary source of these nutrients. Calcium-poor grains and legumes are excluded from the diet. However, leafy greens like kale and dandelion greens, as well as nuts like almonds, are very high sources of calcium. Two notable exceptions are calcium and vitamin D, both of which may be present in the diet in inadequate quantities. Modern humans require much more vitamin D than foragers, because they do not get the same amount of exposure to sun. This need is commonly satisfied in developed countries by artificially fortifying dairy products with the vitamin. To avoid deficiency, a modern human on a forager diet would have to take artificial supplements of the vitamin, ensure adequate intake of some fatty fish, or increase the amount of exposure to sunlight (it has been estimated that 30 minutes of exposure to midday sun twice a week is adequate for most people).[original research?]
On the Paleolithic diet, practitioners are permitted to drink mainly water, and some advocates recommend tea as a healthy drink. Neither alcohol nor coffee is considered "paleo" as our ancestors could not produce these drinks.
Raw vs. cooked
Unlike raw food diets, all foods may be cooked, without restrictions. However, there are Paleolithic dieters who believe that humans have not adapted to cooked foods since the first control of fire by Homo erectus, and so they eat only foods that are both raw and Paleolithic.Some eat raw because of percevied health benifits.
Food groups that advocates claim were rarely or never consumed by humans before the Neolithic agricultural revolution are excluded from the diet. These include:
- dairy products
- grains, for example wheat, rye, and barley, which make it a gluten-free diet
- legumes for example beans and peanuts
- processed oils
- refined sugar
Nutritionists agree that the Paleolithic diet is beneficial in that it cuts processed foods that have been highly modified from their raw state such as white bread, artificial cheese, certain cold cuts and packaged meats, potato chips, and sugary cereals. These often offer less nutrients than their unprocessed equivalents, and may be packed with calories, sodium and preservatives that may increase the risk of heart disease and certain cancers.
A ranking by U.S. News & World Report, involving a panel of experts, evaluated based on factors including health, weight loss, and ease of following. In 2014, it tied for last place out of 32 with the Dukan Diet.
Evidence for the effect of the switch to agriculture on general life expectancy is mixed, with some populations exhibiting an apparent decrease in life expectancy and others an apparent increase. And according to S. Jay Olshansky and Bruce Carnes, "there is neither convincing evidence nor scientific logic to support the claim that adherence to a Paleolithic diet provides a longevity benefit."
- Evolutionary medicine
- Inuit diet
- Modern primitive
- Nutritional genomics
- Paleolithic lifestyle
- Low carbohydrate diet
- Hiatt, Kurtis. "Paleo Diet -- What You Need to Know". U.S. News and World Report. Retrieved 1 June 2014.
- "Caveman fad diet". National Health Service. Retrieved 14 August 2014.
- Voegtlin, Walter L. The stone age diet: based on in-depth studies of human ecology and the diet of man. Vantage Press. Retrieved 11 June 2014.
- "Paleolithic Nutrition — A Consideration of Its Nature and Current Implications". New England Journal of Medicine 312: 283–289. 31 January 1985. doi:10.1056/NEJM198501313120505. PMID 2981409. Retrieved 11 June 2014.
- Cordain, Loren. "The Paleo Diet". The Paleo Diet LLC. Retrieved 11 June 2014.
- "THE PALEO DIET". United States Patent and Trademark Office. Retrieved 12 June 2014.
- "Top diets review for 2014". NHS. Retrieved 14 June 2014.
- Konner M.; Eaton, S. Boyd (2010). "Paleolithic Nutrition: Twenty-Five Years Later". Nutrition in Clinical Practice 25 (6): 594–602. P. 594.
- Eaton, S. Boyd; Konner, M (1985). "Paleolithic Nutrition: A Consideration of Its Nature and Current Implications". New England Journal of Medicine 312: 283–289.
- Elton, S (2008). "Environments, Adaptation, and Evolutionary Medicine: Should We be Eating a Stone Age Diet?". In S. Elton, P. O'Higgins (ed.), Medicine and Evolution: Current Applications, Future Prospects. Boca Raton, FL: CRC Press. P. 9. ISBN 978-4200-5134-6.
- Eaton, S. Boyd; Konner, M (1985). "Paleolithic Nutrition: A Consideration of Its Nature and Current Implications". New England Journal of Medicine 312: 283–289. P. 283 et passim.
- Eaton, S. Boyd; Eaton III, S. Boyd (2000). "Paleolithic vs. Modern Diets: Selected Pathophysiological Implications". European Journal of Nutrition 39(2): 67–70. P. 67, et passim.
- Eaton, S. Boyd; Konner, M (1985). "Paleolithic Nutrition: A Consideration of Its Nature and Current Implications". New England Journal of Medicine 312: 283–289. Pp. 287–88.
- Eaton, S. Boyd; Konner, M.; Shostak, M. (1988). "Stone Agers in the Fast Lane: Chronic Degenerative Disease in Evolutionary Perspective". The American Journal of Medicine 84:739–49.
- Eaton, S. Boyd; Eaton III, S. Boyd (2000). "Paleolithic vs. Modern Diets: Selected Pathophysiological Implications". European Journal of Nutrition 39(2): 67–70. P. 68.
- Eaton, S. Boyd; Konner, M (1985). "Paleolithic Nutrition: A Consideration of Its Nature and Current Implications". New England Journal of Medicine 312: 283–289. P. 284.
- Konner M.; Eaton, S. Boyd (2010). "Paleolithic Nutrition: Twenty-Five Years Later". Nutrition in Clinical Practice 25 (6): 594–602. Pp. 594–95.
- Eaton, S. Boyd; Eaton III, S. Boyd (2000). "Paleolithic vs. Modern Diets: Selected Pathophysiological Implications". European Journal of Nutrition 39(2): 67–70. P. 67.
- Eaton, S. Boyd; Konner, M (1985). "Paleolithic Nutrition: A Consideration of Its Nature and Current Implications". New England Journal of Medicine 312: 283–289. Pp. 284, 285, 286.
- Michael Gurven, Hillard Kaplan. "Longevity Among Hunter-Gatherers: A Cross-Cultural Examination". | url = http://www.anth.ucsb.edu/faculty/gurven/papers/GurvenKaplan2007pdr.pdf
- Cordain, Loren (2010). The Paleo Diet Revised. Houghton Mifflin Harcourt. p. 10. ISBN 978-0470913024.
- Marinangeli, C. P. F.; Jones, P. J. H. (2014). "Deconstructing the Paleolithic Diet: Components that Reduce Cardiovascular Disease Risk". Current Nutrition Reports 3 (2):149–161. P. 149.
- Eaton, M.D., S. Boyd; Shostak, Marjorie; Konner, M.D., Ph.D., Melvin (1988). The Paleolithic Prescription: A Program of Diet and Exercise and a Design for Living. Harper and Row. p. 79. ISBN 978-0060916350.
- Peter S. Ungar; Mark Franklyn Teaford (1 January 2002). Human Diet: Its Origin and Evolution. Greenwood Publishing Group. pp. 67–. ISBN 978-0-89789-736-5.
- Lee, Richard (1969). "Kung Bushmen Subsistence: An Input-Output Analysis". Contributions to Anthropology: Ecological Essays. Ottowa: National Museums of Canada (230): 73–94.
- C. Warinner (2013), "Debunking the Paleo Diet", TEDxOU, 25 January 2013, https://www.youtube.com/watch?v=BMOjVYgYaG8, accessed 21 August 2014.
- Ungar, Peter S.; Grine, Frederick E.; & Teaford, Mark F. (October 2006). "Diet in Early Homo: A Review of the Evidence and a New Model of Adaptive Versatility". Annual Review of Anthropology 35 (1): 209–228. doi:10.1146/annurev.anthro.35.081705.123153.
- Hillard Kaplan, Kim Hill, Jane Lancaster, and A. Magdalena Hurtado (2000). "A Theory of Human Life History Evolution: Diet, Intelligence and Longevity". Evolutionary Anthropology 9 (4): 156–185. doi:10.1002/1520-6505(2000)9:4<156::AID-EVAN5>3.0.CO;2-7. Retrieved September 12, 2010.
- Gurven, Michael; Kaplan, Hillard (2007). "Longevity Among Hunter- Gatherers: A Cross-Cultural Examination". Population and Development Review 33 (2): 321–365. doi:10.1111/j.1728-4457.2007.00171.x. ISSN 0098-7921.
- Osborne, Daniel L.; Hames, Raymond (2014). "A life history perspective on skin cancer and the evolution of skin pigmentation". American Journal of Physical Anthropology 153 (1): 1–8. doi:10.1002/ajpa.22408. ISSN 0002-9483.
- Nestle, Marion (March 2000). "Paleolithic diets: a sceptical view". Nutrition Bulletin 25 (1): 43–7. doi:10.1046/j.1467-3010.2000.00019.x.
- Milton, Katharine (2002). "Hunter-gatherer diets: wild foods signal relief from diseases of affluence (PDF)". In Ungar, Peter S. & Teaford, Mark F. Human Diet: Its Origins and Evolution. Westport, CT: Bergin and Garvey. pp. 111–22. ISBN 0-89789-736-6.
- Richards, Michael P. (December 2002). "A brief review of the archaeological evidence for Palaeolithic and Neolithic subsistence". European Journal of Clinical Nutrition 56 (12): 1270–78. doi:10.1038/sj.ejcn.1601646. PMID 12494313.
- Kolbert, Elizabeth. "Flesh of Your Flesh", The New Yorker, November 9, 2009, accessed January 27, 2011.
- Leonard, William R. (December 2002). "Food for thought: Dietary change was a driving force in human evolution" (PDF). Scientific American 287 (6): 106–15. PMID 12469653.
- Gibbons, Ann (September 2014). "The Evolution of Diet". National Geographic. Retrieved 2014-09-04.
- Kuipers, Remko S.; Luxwolda, Martine F.; Janneke Dijck-Brouwer, D. A.; Eaton, S. Boyd; Crawford, Michael A.; Cordain, Loren; Muskiet, Frits A. J. (2010). "Estimated macronutrient and fatty acid intakes from an East African Paleolithic diet". British Journal of Nutrition 104 (11): 1666–1687. doi:10.1017/S0007114510002679. ISSN 0007-1145.
- Dominy, Nathaniel J.; Vogel, Erin R.; Yeakel, Justin D.; Constantino, Paul; Lucas, Peter W. (2008). "Mechanical Properties of Plant Underground Storage Organs and Implications for Dietary Models of Early Hominins". Evolutionary Biology 35 (3): 159–175. doi:10.1007/s11692-008-9026-7. ISSN 0071-3260.
- Dybas, Cheryl; Siegel, Lee; Scott, Jim (2013-06-03). "A Grassy Trend in Human Ancestors' Diets". National Science Foundation (National Science Foundation). Retrieved 2014-08-31. "Most apes eat leaves and fruits from trees and shrubs. But new studies show that human ancestors expanded their menu 3.5 million years ago, adding tropical grasses and sedges to an ape-like diet. The change set the stage for consuming more modern fare: grains, grasses, and meat and dairy from grazing animals. In four studies of carbon isotopes in fossilized tooth enamel from scores of human ancestors and baboons in Africa from 4 million to 10,000 years ago, researchers found a surprise increase in the consumption of grasses and sedges--plants that resemble grasses and rushes but have stems with triangular cross sections."
- Wynn, J. G.; Sponheimer, M.; Kimbel, W. H.; Alemseged, Z.; Reed, K.; Bedaso, Z. K.; Wilson, J. N. (2013). "Diet of Australopithecus afarensis from the Pliocene Hadar Formation, Ethiopia". Proceedings of the National Academy of Sciences 110 (26): 10495–10500. doi:10.1073/pnas.1222559110. ISSN 0027-8424.
- Cerling, T. E.; Mbua, E.; Kirera, F. M.; Manthi, F. K.; Grine, F. E.; Leakey, M. G.; Sponheimer, M.; Uno, K. T. (2011). "Diet of Paranthropus boisei in the early Pleistocene of East Africa". Proceedings of the National Academy of Sciences 108 (23): 9337–9341. doi:10.1073/pnas.1104627108. ISSN 0027-8424.
- Cerling, T. E.; Manthi, F. K.; Mbua, E. N.; Leakey, L. N.; Leakey, M. G.; Leakey, R. E.; Brown, F. H.; Grine, F. E.; Hart, J. A.; Kaleme, P.; Roche, H.; Uno, K. T.; Wood, B. A. (2013). "Stable isotope-based diet reconstructions of Turkana Basin hominins". Proceedings of the National Academy of Sciences 110 (26): 10501–10506. doi:10.1073/pnas.1222568110. ISSN 0027-8424.
- Cerling, T. E.; Chritz, K. L.; Jablonski, N. G.; Leakey, M. G.; Manthi, F. K. (2013). "Diet of Theropithecus from 4 to 1 Ma in Kenya". Proceedings of the National Academy of Sciences 110 (26): 10507–10512. doi:10.1073/pnas.1222571110. ISSN 0027-8424.
- Lee-Thorp, J.; Likius, A.; Mackaye, H. T.; Vignaud, P.; Sponheimer, M.; Brunet, M. (2012). "Isotopic evidence for an early shift to C4 resources by Pliocene hominins in Chad". Proceedings of the National Academy of Sciences 109 (50): 20369–20372. doi:10.1073/pnas.1204209109. ISSN 0027-8424.
- Dominy, N. J. (2012). "Hominins living on the sedge". Proceedings of the National Academy of Sciences 109 (50): 20171–20172. doi:10.1073/pnas.1218081110. ISSN 0027-8424.
- "Ancient human ancestor 'Nutcracker Man' lived on tiger nuts". University of Oxford (School of Archaeology—University of Oxford). 2013-01-09. Retrieved 2014-08-31. "An Oxford University study has concluded that our ancient ancestors who lived in East Africa between 2.4 million and 1.4 million years ago survived mainly on a diet of tiger nuts"
- Hardy, Karen; Macho, Gabriele A. (2014). "Baboon Feeding Ecology Informs the Dietary Niche of Paranthropus boisei". PLoS ONE 9 (1): e84942. doi:10.1371/journal.pone.0084942. ISSN 1932-6203.
- Daniel Zohary and Maria Hopf, Domestication of plants in the Old World, third edition (Oxford: University Press, 2000), p. 198
- "HART, Thomas C.; IVES, Timothy H.. ''Preliminary Starch Grain Evidence of Ancient Stone Tool Use at the Early Archaic (9,000 B.P.) Site of Sandy Hill, Mashantucket, Connecticut'' Ethnobiology Letters, [S.l.], v. 4, p. 87-95, Sep. 2013.". Dx.doi.org. Retrieved 2014-01-29.
- Perry, George H; Dominy, Nathaniel J; Claw, Katrina G; Lee, Arthur S; Fiegler, Heike; Redon, Richard; Werner, John; Villanea, Fernando A; Mountain, Joanna L; Misra, Rajeev; Carter, Nigel P; Lee, Charles; Stone, Anne C (2007). "Diet and the evolution of human amylase gene copy number variation". Nature Genetics 39 (10): 1256–1260. doi:10.1038/ng2123. ISSN 1061-4036.
- Retica, Aaron (2007-12-09). "Starch Made Us Human". The New York Times (New York, NY: The New York Times Company). Retrieved 2014-08-31. "In a paper published in September in Nature Genetics, George Perry, a graduate student at Arizona State University, Nathaniel Dominy, an anthropology professor at the University of California, Santa Cruz, and their colleagues demonstrate something significant: unlike our fellow primates, modern humans have many copies of a gene that makes a protein in our saliva that is crucial for breaking down starch into glucose."
- Sonnenburg, Erica D.; Sonnenburg, Justin L. (2014). "Starving our Microbial Self: The Deleterious Consequences of a Diet Deficient in Microbiota-Accessible Carbohydrates". Cell Metabolism. doi:10.1016/j.cmet.2014.07.003. ISSN 1550-4131.
- Langkilde AM, Champ M, Andersson H (January 2002). "Effects of high-resistant-starch banana flour (RS(2)) on in vitro fermentation and the small-bowel excretion of energy, nutrients, and sterols: an ileostomy study". Am. J. Clin. Nutr. 75 (1): 104–11. PMID 11756067. Retrieved 2014-07-17.
- Bird AR, Brown IL, Topping DL (March 2000). "Starches, resistant starches, the gut microflora and human health". Curr Issues Intest Microbiol 1 (1): 25–37. PMID 11709851.
- Sajilata, M.G.; Singhal, Rekha S.; Kulkarni, Pushpa R. (2006). "Resistant Starch—A Review". Comprehensive Reviews in Food Science and Food Safety 5 (1): 1–17. doi:10.1111/j.1541-4337.2006.tb00076.x. ISSN 1541-4337.
- Birt DF, Boylston T, Hendrich S, et al. (November 2013). "Resistant starch: promise for improving human health". Adv Nutr 4 (6): 587–601. doi:10.3945/an.113.004325. PMID 24228189. Retrieved 2014-07-18.
- Topping DL, Clifton PM (July 2001). "Short-chain fatty acids and human colonic function: roles of resistant starch and nonstarch polysaccharides". Physiol. Rev. 81 (3): 1031–64. PMID 11427691. Retrieved 2014-07-17.
- Brouns, Fred; Kettlitz, Bernd; Arrigoni, Eva (2002). "Resistant starch and "the butyrate revolution"". Trends in Food Science & Technology 13 (8): 251–261. doi:10.1016/S0924-2244(02)00131-0. ISSN 0924-2244.
- Ahmed, R.; Segal, I.; Hassan, H. (2000). "Fermentation of dietary starch in humans". The American Journal of Gastroenterology 95 (4): 1017–1020. doi:10.1111/j.1572-0241.2000.01848.x. ISSN 0002-9270.
- Shen L, Keenan MJ, Raggio A, Williams C, Martin RJ (October 2011). "Dietary-resistant starch improves maternal glycemic control in Goto-Kakizaki rat". Mol Nutr Food Res 55 (10): 1499–508. doi:10.1002/mnfr.201000605. PMID 21638778. Retrieved 2014-07-17.
- Raben A, Tagliabue A, Christensen NJ, Madsen J, Holst JJ, Astrup A (October 1994). "Resistant starch: the effect on postprandial glycemia, hormonal response, and satiety". Am. J. Clin. Nutr. 60 (4): 544–51. PMID 8092089. Retrieved 2014-07-17.
- Robertson MD, Bickerton AS, Dennis AL, Vidal H, Frayn KN (September 2005). "Insulin-sensitizing effects of dietary resistant starch and effects on skeletal muscle and adipose tissue metabolism". Am. J. Clin. Nutr. 82 (3): 559–67. PMID 16155268. Retrieved 2014-07-17.
- Carbohydrates in human nutrition (Report of a Joint FAO/WHO Expert Consultation, Rome, Italy, 14-18 April 1997). FAO food and nutrition paper 66. World Health Organization. 1998. ISBN 9251041148.
- Nugent A.P. (2005). "Health properties of resistant starch, British Nutrition Foundation". Nutrition Bulletin 30 (1): 27–54. doi:10.1111/j.1467-3010.2005.00481.x.
- National Research Council (2005). Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. National Academies Press. ISBN 0309085373.
- "THE PALEO DIET PREMISE". The Paleo Diet. Retrieved 14 June 2014.
- "Protein". CDC. US Government. Retrieved 14 June 2014.
- "Carbohydrates". USDA. Retrieved 14 June 2014.
- "Most Americans Should Consume Less Sodium". CDC. Retrieved 14 June 2014.
- Prentice, A. M.; Jebb, S. A. (2003). "Fast foods, energy density and obesity: A possible mechanistic link". Obesity Reviews 4 (4): 187–94. doi:10.1046/j.1467-789X.2003.00117.x. PMID 14649369.
- Rolls, Barbara. The Volumetrics Eating Plan: Techniques and Recipes for Feeling Full on Fewer Calories. ISBN 0-06-073730-1.[page needed]
- Ello-Martin, Julia A; Roe, Liane S; Ledikwe, Jenny H; Beach, Amanda M; Rolls, Barbara J (2007). "Dietary energy density in the treatment of obesity: A year-long trial comparing 2 weight-loss diets". The American Journal of Clinical Nutrition 85 (6): 1465–77. PMC 2018610. PMID 17556681.
- Milton, Katharine (2000). "Back to basics: why foods of wild primates have relevance for modern human health" (PDF). Nutrition 16 (7–8): 481–83. doi:10.1016/S0899-9007(00)00293-8. PMID 10906529.
- Cunnane, Stephen C. (1 August 2005). "Origins and evolution of the Western diet: implications of iodine and seafood intakes for the human brain". The American Journal of Clinical Nutrition 82 (2): 483; author reply 483–4. PMID 16087997.
- "Calcium: Dietary Supplement Fact Sheet". U.S. Department of Health & Human Services. Retrieved 4 August 2014.
- "Dietary Supplement Fact Sheet: Vitamin D". Office of Dietary Supplements (ODS). National Institutes of Health (NIH). Retrieved 2010-04-11.
- Paul Insel, Don Ross, Kimberley McMahon, Melissa Bernstein (2010). Nutrition. p. 410. ISBN 0-7637-7663-7.
- Cordain, Loren. "ONE TEQUILA, TWO TEQUILA, THREE TEQUILA… PRIMAL!". Retrieved 14 June 2014.
- Eaton, S. Boyd (2006). "Preagricultural Diets and Evolutionary Health Promotion". In Peter Ungar. Evolution of the Human Diet: The Known, the Unknown, and the Unknowable. Oxford, USA: Oxford University Press. p. 400. ISBN 0-19-518346-0.
- Raw Paleolithic Diet & Lifestyle — Raw Paleo Lifestyle for Health
- Minger, Denise. "Why Raw?". "I just feel ... better on the raw end of the spectrum—needing less sleep, having a stronger desire to move and exercise, brighter eyes, better immunity, a greater ratio of happy ... moods to bluer ones"
- Jabr, Ferris. "How to Really Eat Like a Hunter-Gatherer: Why the Paleo Diet Is Half-Baked". Scientific American. Retrieved 14 June 2014.
- "Best Diets Overall". U.S.News & World Report. 2012.
- Harris,Marvin and Eric B. Ross, ed. (1987). "IV. Pre-State Foodways". Food and Evolution: Toward a Theory of Human Food Habits. Philadelphia: Temple University Press. ISBN 0-87722-668-7.
- Olshansky, S. Jay; Carnes, Bruce A. (2001). The quest for immortality : science at the frontiers of aging. New York: Norton. p. 191. ISBN 978-0393323276.