Better hunters means more meat. More meat means bigger brains. Bigger brains means modern civilization. Modern civilization means more vegans. More vegans means less meat. Less meat means smaller brains. Smaller brains means we return to the Neanderthals. I rest my case.
The Indian word for vegetarian means poor hunter.
More meat means more cancer and more heart attacks, which means shorter life spans. My mostly vegetarian parents & grand parents in India (they could afford only 1 meal with meat during the week) all lived 93-103 years, with zero history of cancer. I arrived in USA at age 20 and soon gained 50 lbs! I need to cut down on T-bones and rib-eye but it is addicting. My diet almost killed me, but then I took up walking 30 miles every week at age 58, and now feel great nearing age 80.
The Neanderthal brain was larger than the modern human brain.