You have to keep in mind your body does not simply break down food to soley build muscle, and even if it did, your body makes myostatin, which limits muscle growth, so no you do not gain muscle on a 1:1 ratio with the protein you eat. I'm surprised someone on here asked if protein is important, good lord man how can you know so little? Protein is greek, Pro=most, Tein=important, or Most Important.
