nutrition is especially hard though. I doubt any study which suggests that one changed input has this direct output. There's so much more than just ratio of mac

nutrition is especially hard though. I doubt any study which suggests that one changed input has this direct output. There's so much more than just ratio of macronutrients. Total calories, when during the day you're eating them, lifestyle, exercise habits. Obviously you can get away with eating a lot worse and not get fat if you are expending all those calories.