73 grs of protein? Are you joking? Your body needs much more. You have skin, internal orgams, hair, etc... they all need some kind of protein... going low in protein and high in carbs will make you fat... Ketogenics diets exist for a reason. If you cut your proteins to a minimum and icrease carbs you will not build 1kg of muscle in a year. Proteins also have calories, and they are slower to be metabolize, which is good to maintain or increase bw whitout putting fat on!