So you're telling me that a person that weighs 300 Lbs. with 50% body fat needs 300g of protein per day to maintain his muscle? Keep in mind that just because it says 50% does not mean he's also 50% muscle. Muscle, fat, skeleton, organs, skin, water weight etc. are all taken into account. So in reality, he'd probably be around 20-25% maybe less. But he needs 300g of protein? You are wrong. I hope that explanation clarifies it better.