I read some about this subject today. Why, exactly, is the "debate" seemingly constantly centered around a discussion of whether or not that's how people from long ago actually ate? Isn't that completely irrelevant? We should be able to determine what dietary system is best regardless of who ate what in 18000 BC.

Anyway eating vegetables, fruit, nuts, seeds, and lean meats is always going to be good for you. But come on, if you're really going to care if it's what "Paleolithic" humans would have eaten, you basically can't eat ANYTHING that is actually sold in grocery stores, including all the meat and vegetables there.

Also, I like dairy and grains a lot and I wouldn't give them up even if it was slightly better for me. Plus physical activity matters at least as much to physical health as diet, and probably more.