The Evolution of paleo
As Dr. Cordain and others' scientific research reveal - the evolutionary, genetic, and clinical evidence point to a natural (i.e., unprocessed foods), omnivorous diet as the healthiest way to eat. Dr. Cordain's research shows that 70% of the average caloric intake of Americans is from foods that did not even exist for our Paleolithic ancestors. This discordance is having tremendously negative health consequences for our society as a whole.
Paleo is in our Genes
Our genes determine our optimum diet, and our genes evolved according to the environments in which our ancient ancestors lived, including the foods they ate. Our Paleolithic ancestors did not eat just one single diet, but rather they ate within a range of natural, unprocessed diets - depending on variables like geography, climate, competition, ecologic niche, season, and glaciations. All of these Paleolithic diets did share some universal characteristics, though.