Diet is a topic in which there ten thousand people eagerly overcomplicate the situation, building mountains from molehills, confusing the issue, and generally making a mess of things. Ignore them all. Still, there is an interesting dichotomy that arises as a result of research on calorie restriction on the one hand and on protein intake and muscle mass in older individuals on the other.
Cooking food – yes, eating meat specifically – no. Also don’t forget agriculture