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The development of a larger brain in human ancestors is directly linked to dietary changes, as evidenced by [1] which explains how a shift toward meat consumption provided the necessary energy to support brain growth.
Facts (1)
Sources
How do we know what they ate? - The Australian Museum australian.museum 1 fact
claimIncreasing the proportion of meat in the diet allowed the digestive system of human ancestors to shrink, freeing up energy to sustain a larger brain.