Your brother, a bodybuilder, is seeking your advice. He wants to gain more muscle by consuming 3.5 g protein/kg/day. How would you respond to him?
a. There is no scientific evidence that such a high intake of protein is more effective for increasing skeletal muscle size.
b. Consuming 3.5 g protein/kg/day will speed up the rate of gaining muscle, so you should consume just that much.
c. Consuming 3.5 g protein/kg/day is not enough protein per day to speed up the rate of gaining muscle, so you should consume more protein.
d. You should not exceed 0.8 g protein/kg/day, because that is the RDA, and you can surpass your body's ability to excrete ammonia, a by-product of protein metabolism.