"From Eaton's Paleolithic nutrition work in particular, he learned that diabetes first appeared in humans about the same time they discovered agriculture.
"A natural diet is what is edible when you are naked with a sharp stick."
Eaton has published studies on remains of Paleolithic man purporting to show that almost none of the immune system disorders that afflict modern man, including diabetes and arthritis, were present back then. Studies of modern-day hunter-gatherers living in the African bush, he says, show they have very low serum cholesterol levels and rarely suffer from heart disease. Paleolithic man -- if he didn't die from an infection or get eaten by a wild animal -- could expect to live a very long life, says Eaton, without many of the disorders that affect us today."