Ray may be right that survival on the grasslands of our African ancestors depended on game rather than vegetables, unless these grasslands differed from Ray's own hunting habitat. What we need to know is whether our ancestors were mainly confined to such open grasslands during human evolution. Perhaps they stayed near the waters and perhaps their habitats differed. As far as I can figure out we don't even know for sure that there was savanna at the places in question and if so what kind of savanna. I would expect Ray's diet to be very healthy, but the question is if saturating vegetables rich in carbohydrates with a low glycemic index could have been part of lower Paleolithic diets and hence healthy too. Until further notice I consider humans omnivores. Staffan Lindeberg