Monkeys Did Not Gain Big Brains By Shrinking Guts, Duke University Study

DID shrinking guts and high-energy food help us evolve enormous, powerful brains? The latest round in the row over what's known as the "expensive tissue hypothesis" says no. But don't expect that to settle the debate. The hypothesis has it that in order to grow large brains relative to body size, our ancestors had to free up energy from elsewhere - perhaps by switching to rich foods like nuts and meat, which provide more calories and require less energy to break down, or possibly by learning to cook: cooked food also requires less energy to digest.