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Loren Cordain (born 24 October 1950) is an American scientist who specializes in fields of nutrition and exercise physiology. He is notable as an advocate of the paleolithic diet and a researcher into paleolithic nutrition; he wrote numerous peer-reviewed articles on the subject, as well as several popular books, most notably, The Paleo Diet. He has written that diet is at the root of modern health problems such as cardiovascular disease, autoimmune diseases, acne, and hyperinsulinemic diseases
He argues that practitioners of the Paleolithic diet should derive about 56%–65% of their food energy from animal foods and 36%–45% from plant foods in a diet high in protein (19%–35% energy) and relatively low in carbohydrates (22%–40% energy), with a fat intake (28%–58% energy) similar to or higher than that found in Western diets. 
In modern forager diets, dietary protein is characteristically elevated (19%–35% of energy) at the expense of carbohydrate (22%–40% of energy).
He has also written on lifestyle in the evolutionary context, arguing that the optimal level of physical activity is on the order of 90 calories per kilogram per week (900 cal/day for a 70 kg human.)
Loren Cordain obtained a B.S. in Health Sciences from Pacific University, Forest Grove, Oregon in 1972. In 1978 he got his M.Sc. in Exercise Physiology at the University of Nevada-Reno. In 1981 he was awarded his Ph.D. in Exercise Physiology by the University of Utah, Salt Lake City.
The Paleo Diet Revised: Lose Weight and Get Healthy by Eating the Foods You Were Designed to Eat, Houghton Mifflin Harcourt (Revised edition December 7, 2010) ISBN 0470913029
The Paleo Diet for Athletes: The Ancient Nutritional Formula for Peak Athletic Performance (with Joe Friel) Rodale Books (Revised edition October 16, 2012) ISBN 160961917X
The Paleo Diet Cookbook: More Than 150 Recipes for Paleo Breakfasts, Lunches, Dinners, Snacks, and Beverages (with Nell Stephenson) Houghton Mifflin Harcourt (December 7, 2010) ISBN 0470913045
The Paleo Answer: 7 Days to Lose Weight, Feel Great, Stay Young, Houghton Mifflin Harcourt (October 16, 2012) ISBN 1118404157
Works – example journal papers
- Cordain, L. (1999). "Cereal grains: humanity’s double-edged sword." World Review of Nutrition and Dietetics. 84:19-73.
- O’Keefe J.H., Cordain L. (2004) "Cardiovascular disease as a result of a diet and lifestyle at odds with our Paleolithic genome: how to become a 21st century hunter-gatherer". Mayo Clinic Proceedings 79:101-108.
- Cordain L, Eaton SB, Sebastian A, Mann, N, Lindeberg S, Watkins BA, O’Keefe JH, Brand Miller J. (2005) "Origins and Evolution of the Western Diet: Health Implications for the 21st Century". American Journal of Clinical Nutrition 81:341-54.
- Cordain L, Eaton SB, Brand Miller J, Lindeberg S, Jensen C, "An evolutionary analysis of the etiology and pathogenesis of juvenile-onset myopia". Acta Ophthalmologica Scandinavica Vol. 80 No. 2:125–35.
- Cordain L, Lindeberg S, Hurtado M, Hill K, Eaton SB, Brand-Miller J, "Acne vulgaris: a disease of Western civilization". Archives of Dermatology V138 No. 12:1584-90.
- Cordain L, (2005) "Implications for the role of diet in acne". Seminars in Cutaneous Medicine and Surgery Vol. 24 No 2:84-91.
- Cordain, Loren (2006). "Implications of Plio-Pleistocene Hominin Diets for Modern Humans (PDF)". In Ungar, Peter S. Evolution of the Human Diet: The Known, the Unknown, and the Unknowable. Oxford, USA: Oxford University Press. pp. 363–83. ISBN 0-19-518346-0.
- Loren Cordain. The Paleo Diet. ISBN 0-471-22567-3.
- O'Keefe JH Jr, Cordain L, Harris WH, Moe RM, Vogel R (June 2004). "Optimal low-density lipoprotein is 50 to 70 mg/dl: lower is better and physiologically normal". Journal of the American College of Cardiology (American College of Cardiology) 43 (11): 2142–46. doi:10.1016/j.jacc.2004.03.046. PMID 15172426.
- O'Keefe JH Jr, Cordain L, Jones PG, Abuissa H. (July 2006). "Coronary artery disease prognosis and C-reactive protein levels improve in proportion to percent lowering of low-density lipoprotein". The American Journal of Cardiology 98 (1): 135–39. doi:10.1016/j.amjcard.2006.01.062. PMID 16784936.
- Cordain, Loren (1999). "Cereal grains: humanity's double-edged sword" (PDF). World review of nutrition and dietetics. World Review of Nutrition and Dietetics 84: 19–73. doi:10.1159/000059677. ISBN 3-8055-6827-4. PMID 10489816.
- Cordain, Loren (2006). "Dietary implications for the development of acne: a shifting paradigm (PDF)". In Bedlow, J. US Dermatology Review 2006—Issue II. London: Touch Briefings Publications.
- | author = Cordain L, Eades MR, Eades MD | title = Hyperinsulinemic diseases of civilization: more than just Syndrome X | journal = Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology | volume = 136 | issue = 1 | pages = 95–112 | year = 2003 | pmid = 14527633 | doi = 10.1016/S1095-6433(03)00011-4 | url = http://thepaleodiet.com/wp-content/uploads/2011/02/Hyperinsulinemic-diseases-of-civilization-more-than-just-Syndrome-Xabstract.pdf | format = PDF
- Cordain L, Miller JB, Eaton SB, Mann N, Holt SH, Speth JD (1 March 2000). "Plant-animal subsistence ratios and macronutrient energy estimations in worldwide hunter-gatherer diets". The American Journal of Clinical Nutrition 71 (3): 682–92. PMID 10702160.
- Cordain L, Eaton SB, Miller JB, Mann N, Hill K (March 2002). "The paradoxical nature of hunter-gatherer diets: meat based, yet non-atherogenic" (PDF). European Journal of Clinical Nutrition 56 (Suppl 1): S42–52. doi:10.1038/sj.ejcn.1601353. PMID 11965522.
- Cordain, Loren (2006). "Saturated fat consumption in ancestral human diets: implications for contemporary intakes". In Meskin, Mark S.; Bidlack, Wayne R.; & Randolph, R. Keith. Phytochemicals: Nutrient-Gene Interactions. CRC Press. pp. 115–26. ISBN 0-8493-4180-9.
- Cordain L, Miller JB, Eaton SB, Mann N (1 December 2000). "Macronutrient estimations in hunter-gatherer diets". The American Journal of Clinical Nutrition 72 (6): 1589–92. PMID 11101497.
- Cordain L et al. (1998). "Physical activity, energy expenditure and fitness: an evolutionary perspective". International Journal of Sports Medicine.
- "Loren Cordain, Ph.D.".
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