[watwut]

We evolved to be remarkably adaptable species. Our social and environmental conditions influence so much, that there is zero reason to assume that any particular behavior in prehistoric time is fixed and not just adaptation.

Moreover, half of those "past evilutionary people were like this or that" is guess made out of flimsy evidence at best. It is best we have maybe, but not accurate. (For that matter, majority of popular "past people were x" is wrong even for periods where we have a lot of documentation of).

[wruza]

My anecdotal evidence is that when I do sleep at night, eat less and have a regular sex, my body works very well in my 30s. Things change instantly once you lower some grips. Something in me is not just adaptation, but finely tuned core mechanisms. In fact, our current live is very different from what serves well to us. And this is even exploited to large extents – see ads, politics, social irrationality. If it were mere adaptation, then we could be rational and adaptive af.