Anatomically modern humans appeared over 100,000 years ago. They made tools. They ate meat. They lived the same and did the same things for close to 60,000 years. That is when, suddenly, for no known reason, our ancestors 'got smart' and their tools improved, they started art, they started religious practices and rituals.
So, 60,000 years of meat eating did nothing. What did cause this great change? I have no idea. I don't think that anthropologists have any idea either.