After reading that I'll explain even more. You see when your body is used to producing energy from simple starches and sugars, when it get's "hungry" it will burn the quickest burning fuel available to it...which is lean muscle mass actually. This is why when you see a starving person or depleted cancer patient they look "flappy" They have stored body fat but no more muscle. If you give your body enough protein and Leucine (amino acid that triggers protein synthesis) it will sustain your lean body mass during treatment.