How varied could past Paleo diets have been and does it really matter? | Paleo Style In summary, quantitatively significant potential plant sources for Paleolithic diets are limited and we were not adapted to consume them in large quantities. There is no evidence for plant-dominated diet in our pre-agricultural human past and certainly not in present day HG groups in places where animals are as abundant as they were in Paleolithic times. On the other hand there is substantial evidence that meat and fat were always the major components of the human diet. If that is the case how different could the various Paleo diets be?