The argument challenges the widely held view among anthropologists that eating meat was the critical factor in setting the stage for the evolution of humans. While focusing on fat over meat may seem like a subtle distinction, the difference is significant, Thompson says. It’s a mystery to scientists how our human ancestors met the calorie demands to develop and sustain our larger brains. “Our human ancestors were likely awkward creatures,” Thompson says. Scientists ought to begin looking for evidence of bone-smashing behavior in early human ancestors, Thompson said.