A complex fiber - layering system promotes healthy digestion, and higher protein levels help pets maintain lean body muscle mass while losing weight. (petbusiness.com)
Protein metabolism is controlled by various hormones, and after the growth hormone drops off at around age 30, high protein intake will not increase body muscle mass. (hawaiinaturopathicretreat.com)
Plus, nothing puts on lower body muscle mass like squats. (coachcalorie.com)