Do you have any studies that support those claims?
Dunno, I have a hard time believing that vegetarianism is the way to go....anecdotally and evolutionarily. The very first day of my anthro 102 class we went over the decline of health that went along with the agricultural revolution in nearly every race, i.e. native americans, egyptians, etc. It's pretty standard stuff.....
also, evidence that we only started hunting large game 20k years ago? From what I have learned, it began during the acheulian tradition, about 1.2 million years ago....there is evidence that elephants were hunted around that time. That is to say nothing of saturated fat intake, but I am pretty sure intense hunting DID exist.