Non-plant protein was probably consumed by almost every pre-historic human. Indeed the quantities were probably lower, but for those societies that consumed in

Non-plant protein was probably consumed by almost every pre-historic human. Indeed the quantities were probably lower, but for those societies that consumed insects it could be quite high. Crickets, grasshoppers, and many other insects have incredibly high protein/mass ratios and are readily available. I have zero interest in consuming those forms, but I also 99% avoid any animal proteins. If a prime rib steak falls on my plate, however, I will not send it away! But the agricultural revolution itself is probably one of man's greatest mistakes. It concentrated people, caused greatly increased population growth, ruined lands, created things to fight over, etc. Pre-agriculture was likely a better natural global balance.