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GOG above posted the reason modern science gives for the correlation between meat and brain development,to go against that evolution seams counter intuitive.If I want to evolve a smaller brain and less cognitive ability in my progeny then I'll start eating vegan.
If one believes this theory that human brains only became as highly developed as they did because humans derived energy from eating meat (and more specifically, cooked meat), then one should not miss the irony in the theory that our highly developed brains are what now allow us the luxury of choosing not to eat meat.