The stomach and small intestine are organs that consume approximately as much energy as the brain. Thus, gastrointestinal diminution has a strong impact on the reduction of basal metabolism. This makes highly nutritious and highly digestible food essential. Given that meat eating and cooking played an important role in providing such quality food, this is a very consistent hypothesis.

■References (Books, papers, Web articles, etc.)
Catching Fire: How Cooking Made Us Human　　Richard Wrangham　 Basic Books; Reprint edition (September 7, 2010)

Related iCards： Human Behavioral Evolution 3: The Use of Fire and Cooking (Vol 2.)

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■The References list of “Evolution of Human Sociality”