I like watching PBS and National Geographics type shows and it seems the most primitive tribes they recorded before they were modernized had already been eating animal flesh for years. I have never seen documented shows that show tribes that lived for hundreds of years, yet I read stories written by MDs about such peoples. Must be that government owned media we hear about so much??
If we knew people could easily live to be 250, then we would be demanding that our owners give us the things we would need to do this also! So we are shown shows and books that show man dies well before age 100 and that man is healthier today than he was in the past because of the use of oil and metalic drugs.
No matter what the food source, the less manufactured the healthier the population, this is only common sense.