Second this. I am as critical as anyone of the naturalistic fallacy, and don't generally subscribe to the idea that what worked for cavemen will work for me.

However, the metabolic science is there if you read it, and I can't argue with the profound effect switching to a diet based on meat, eggs and other sources of saturated fats has had on my body.

I eat as much as I want, whenever I want, I'm never really hungry any more, and I've been losing fat and gaining muscle without thinking about it at all. It's pretty incredible.