my argument is that due to recent farming methods, the meat we eat is getting more and more unhealthy. It might have helped us evolve, but take, for example, a pig. Before the domestication of animals, a pig was ~3% fat, 97% "good stuff". By now, the fat content is over 30%, and I don't want to know what's in the rest.
EDIT: back then, fat was "good stuff", so 100% good stuff. Now probably <30%