A review of 49 studies on a total of 1800 weightlifters, who lifted at least twice a week for at least six weeks, found that doubling the recommended Dietary Allowance (RDA) of protein increased strength gains by nine percent and added about a pound of muscle (British Journal of Sports Medicine, Mar 1,2018;52(6):376-384). With aging, the extra protein offered less muscle growth. The authors found no difference between different sources of protein or whether the extra protein came from food or supplements. They wrote that going to the gym and doing resistance exercise is what makes muscles grow, not taking large amounts of protein from any source….