One can not establish any sound theory starting from wrong premises.

enough food, enough meat

We have records of two periods as such, medieval warming and '50s up to day. There's speculations about pyramid builders, who were obviously well fed 8000 BC, Han Dynasty and Aztec's Rise. That's it.

All the rest of human history is starving, most of anyone's life being frantic search for food to live until tomorrow.

Allow me to bring up a fact human being unable to digest flesh.

We have to apply heat to break down long myofibril molecules, as we lack strong stomach acids as felines or canines do (having those would limit our lifespan to 20-ish or so).

Hunters ate blood and internal organs - liver, spleen, kidneys, brains, semi-digested food in bowels - until the fire got mastered, which is recent event by evolutionary perspective.

We are fruit predators, applying fermentation and fire to eat anything else - muscles, skin, bone marrow, leaves, stems, roots...