Chapter

Obesity: An Evolutionary Perspective

Robin I.M. Dunbar

in Insecurity, Inequality, and Obesity in Affluent Societies

Published by British Academy

Published in print April 2012 | ISBN: 9780197264980
Published online January 2013 | e-ISBN: 9780191754135 | DOI: http://dx.doi.org/10.5871/bacad/9780197264980.003.0003

Series: Proceedings of the British Academy

Obesity: An Evolutionary Perspective

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The brain consumes about 20 per cent of the total energy intake in human adults. Primates, and especially humans, have unusually large brains for body size compared with other vertebrates, and fuelling these is a significant drain on both time and energy. Larger-brained primates generally eat fruit-intense diets, but human brains are so large that a reduction in gut size is needed to free up sufficient resources to allow a larger brain to be evolved, placing further pressure on foraging. The early invention of cooking increased nutrient absorption by around 30 per cent over raw food. Increasing digestibility in this way perhaps inevitably leads to risk of obesity when food is super-abundant, as it is in post-industrial societies. However, obesity has clearly been around for a long time, as suggested by the late Palaeolithic Venus figures of Europe, so it is not a novel problem.

Keywords: energy intake; fuelling the brain; evolution; brain size; digestibility; cooking; obesity

Chapter.  5738 words. 

Subjects: Health, Illness, and Medicine

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