Personally, I lost my taste for meat as a result of keto (eating mostly meat for a couple years), so I rarely eat meat anymore, and I'm just fine.  I'm not super sure what you're on about. Meat has always been a precious commodity and most diets were heavy in vegetables and grains up until the advent of modern industrial farming. The modern diet is high in plant derivatives, ie high fructose corn syrup, but that's hardly a indictment against a plant based diet.