"came up" with these numbers using trusted Kinesiology studied facts. I used also Ben Pakulski's calorie breakdown which involves BF% which I know mine which will make this even further accurate. I'm consuming the protein to keep my muscles from deteriorating while I'm cutting. And I'm taking in the fat to put my body into Ketosis (Pakulski, Polaquin). Look into it. The carbs are only really needed for before workout, immediately after workout and post workout meal.