No baked potatoes for ancient Europeans

 Why do humans have such big brains compared to other primates? Anthropologists generally agree that this trend in evolution was spurred by diet. If any of us ate like wild  chimpanzees or gorillas we wouldn't do very well. We lack the colonic power to process fiber into large amounts of short-chain fatty acids and chimp diets just aren't calorically rich enough for our brains. Anthropologists are divided on which foods enabled our large brain size, but there are two popular theories: