As opposed to that determined by our socio-economic and cultural development... And would be all be healthier eating like this?
So, I reckon
mostly nuts seeds and berries
water
roots? parsnips and carrots
very little complex carbs (vv occasional potatoes, grains etc?)
bit of greenery
fasting one or two days a week
meat - loads of it - every couple of weeks at most...
I would be skeletal but glowing?