Vitruvius at The Sagacious Iconoclast explains why cheese is an unlikely Paleolithic (Old Stone Age) food:
I was recently involved in a discussion in which some folks were attempting to distinguish between what they were calling “processed” cheese and other (presumably non-processed) cheese, without defining what they mean by “processed” cheese. As I think that’s a less than optimal approach, I’d like to take a moment to sketch out why that is so; perhaps increasing, in the process, your enjoyment of cheese forever.
Neolithic Cheese
It’s a moderately lengthy article, but well worth it for the amusement and erudition. You’ll learn how cheese is made, starting with the photons.
Paleo Diabetic 