I'll add this from one of my favorite people in the fitness space:
Protein Requirements for Athletes
So how much is optimal? Well as the above suggests, there is no practical limit to daily or even per meal protein intake but I don’t want people reading this to think I’m suggesting ALL THE PROTEIN.
At some point, protein intake probably gets excessive in a practical sense or simply crowds out carbohydrates and fats (or becomes too damn unaffordable). So there’s some happy medium between the asinine recommendation and eating all the protein.
In the Protein Book I referenced Wolfe and Tipton stating:
Getting into recommendations, the paper points out that a daily protein intake of 2.5-3.0 g/kg (1.1-1.4 g/lb) for strength/power athletes is not harmful, may give small but important performance improvements over the long-term, and will more than cover any needs for protein synthesis (it’s conceivable but understudied that anabolic steroids could increase requirements even further). Any excess will simply be oxidized off in the first place; I’d note again that some researchers feel that the end products of AA oxidation may contribute to the overall anabolic drive in the body.
And I’d stand by that at least for high level athletes looking to optimize all potential aspects of performance including non-muscle tissues that utilize protein. Assuming that it doesn’t prevent sufficient carbohydrate and fat intakes, that level of intake has no downsides and may have long-term benefits (many of which would not show up in short-term studies to begin with).
Mind you, this is truly for high-level athletes and wouldn’t really apply for the general recreational trainee or what have you. In that situation, 2.2 g/kg or the standard 1 g/lb is likely to be more than sufficient. Why not give a lower value?
Well in practice if the average person shoots for 1 g/lb they will probably fall short to begin with and end up lower than that. Give them 0.8 g/lb (1.6 g/kg) and they will end up even lower and potentially run into problems in terms of sub-optimal protein intakes.
Irrespective of that, I think I’ve shown that the idea that using muscle protein synthesis as the endpoint to determine per meal or per day protein intake maximums is simply asinine. I’m still baffled.
A look at why the popular suggestion that protein requirements for athletes can be met by consuming 0.25 g/lb/meal four times per day is bafflingly wrong.
bodyrecomposition.com