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Frederick L. Coolidge – Meat, Vegetarians, and the Evolution of Gut Flora

Increased meat in ancient hominin diets, beginning about 3 million years ago, meant that guts (large and small intestines) could become shorter because they could extract more expeditious calories in shorter lengths. This change in diet was directly responsible for the steady development of bigger brains beginning at this time. But what other factors might have helped the natural selection for shorter …