A new meta-analysis finds there is no additional benefit from protein supplementation in amounts greater than 1.6 g/kg/day. The often recommended gram per pound is excessive.
Dietary protein supplementation significantly enhanced changes in muscle strength and size during prolonged RET (resistance training) in healthy adults. Increasing age reduces and training experience increases the efficacy of protein supplementation during RET. With protein supplementation, protein intakes at amounts greater than ~1.6 g/kg/day do not further contribute RET-induced gains in FFM (fat free mass)