Those societies, that were vegetarian and enjoyed good health, ate a great deal of raw dairy. Weston A. Price (www.westonaprice.org) and Ronald Schmid have written about these societies. I do not believe that a diet devoid of animal source foods is sustainable. The Kung eat meat rather infrequently, but hunt every few days to get meat...spending a disproportionate amount of energy to hunt as compared to gathering...they cannot live without meat. If they could they would just eat mongomongo nuts. Brad