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The “Social Brain Hypothesis” Says Big Brains Help Manage Complex Social Lives. While A 2017 Study Suggests Diet (Fruit/Meat) Predicts Brain Size Better Than Sociality, Modern Views Integrate Both: High-Quality Food Provides The Energy, While Social Complexity Creates The Demand. Brain Evolution Is A Mix Of What We Eat And Friends Circle.

BBC – Earth – A change in diet may have helped our brains get so big

http://www.bbc.com/earth/story/20170327-why-our-brains-grew-so-big

Many anthropologists think that living in large social groups drove the evolution of bigger brains, but new findings call that into question