Since higher protein intakes seem to have no negative effects in healthy people, one may want to err toward the higher amounts.
I haven't seen anything over 3.3g/kg recommended anywhere, and most people seem to recommend 1.4-2g/kg as a good baseline amount. The ISSN recommends this (see here: http://stevenlow.org/issn-position-statements-protein-and-ex...), however the ISSN does recommend higher amounts when losing weight:
Higher protein intakes (2.3–3.1 g/kg/d) may be needed to maximize the retention of lean body mass in resistance-trained subjects during hypocaloric periods.
Of course, none of this is required to get fit - you don't need to do the optimal thing to get a basic result. But you'll definitely gain lean mass faster if you do follow this. Those recommendations for weight gain (say 2g/kg with a caloric surplus) is easy to achieve with no supplementation and normal food, at least for an omnivore - vegans may have to work harder to get there.
Since higher protein intakes seem to have no negative effects in healthy people, one may want to err toward the higher amounts.
I haven't seen anything over 3.3g/kg recommended anywhere, and most people seem to recommend 1.4-2g/kg as a good baseline amount. The ISSN recommends this (see here: http://stevenlow.org/issn-position-statements-protein-and-ex...), however the ISSN does recommend higher amounts when losing weight:
Higher protein intakes (2.3–3.1 g/kg/d) may be needed to maximize the retention of lean body mass in resistance-trained subjects during hypocaloric periods.
Of course, none of this is required to get fit - you don't need to do the optimal thing to get a basic result. But you'll definitely gain lean mass faster if you do follow this. Those recommendations for weight gain (say 2g/kg with a caloric surplus) is easy to achieve with no supplementation and normal food, at least for an omnivore - vegans may have to work harder to get there.