Please present to me any period in recorded history where humans have been
vegetarians. At no time in the history of mankind through any research I have ever studied has mankind as a whole been a vegetarian species. I won't deny there have been times of famine where foods of any kind have been scarce, but Man as a species has never gone without meat for even one lifetime, much less any socialogically significant period of time.
Also, Bruce from Melbourne, please show me a census of any nation or group of nations that counts hundreds of millions of vegetarians as a significant part of their population. Yes, I'll admit I'm aware of some, but with a population of some 8 billion people on Earth, you imply that fully 10% of them (still far from a majority) are not omnivorous.