Strange. So Evolutionary Psychology often assumes a certain sort of paleolithic environment as having been essential to human evolution, and thus they explain behaviors by showing how they would have increased fitness back on the ole' cave man days.
So I note with some interest some modern idiots advocating a 'caveman' diet as being the healthiest and conducive to a long life: Eating Paleo in NYC. Note that they make a very basic mistake here: they say that the foods we evolved to eat are the healthiest; this is perhaps true, but evolution is about reproduction, not longevity or health. There is thus no reason to think that the foods we used to eat back in the cave days are any healthier than what we eat now, at least not for evolutionary reasons, at least not necessarily. (See what John Hawks says)
People are idiots. Plus, you know, the whole sustainability thing.