If, as is typical, only 22.0 % of the food calories go into mechanical energy, what would be the answer to part (a)? (note: in this and all other problems, we are assuming that 100 % of the food calories that are eaten are absorbed and used by the body. this is actually not true. a person's "metabolic efficiency" is the percentage of calories eaten that are actually used; the rest are eliminated by the body. metabolic