Read more about the article Meat-Eating: Evolution of Our Brain and Gut
Throughout the human lineage, both the gut and the brain have been composed of metabolically expensive tissue—that is, they require a disproportionate amount of energy to function properly. According to one theory, as the human brain evolved to be bigger the gut had to shrink, to leave more energy available for the brain.

Meat-Eating: Evolution of Our Brain and Gut

Without the abundance of calories afforded by meat-eating, the human brain simply could not have evolved to its current form.Because gut size is correlated with diet, and small guts necessitate a diet focused on high-quality food that is easy to digest.

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