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Most current scientific reviews state that the optimal protein intake for maximizing muscle gain is well below what many bodybuilders consume. Is this true?
themusclephd.com
During a cut, bodybuilders should shoot for ingesting 2.3-3.1g/kg of protein
(7), and can even go up to 4.4g/kg as this has been shown to be an effective method for replacing other macronutrient calories and not causing fat gain
(3). This greater protein intake doesn’t always appear to lead to more lean mass gains than ~2.2g/kg
(1,
2,
3) but it does seem to help body re-composition efforts. Which, frankly, most bodybuilders are interested in – gaining muscle and losing fat at the same time.
However, we do see some evidence of greater protein intakes leading to more lean mass gains. One such study found that consuming 2.7g/kg per day was more effective for gains than 2.3g/kg per day
(25), however, the 2.7g/kg group achieved their higher protein intake through consuming a protein shake before and after training. This practice has also been shown to be more effective for gains than taking protein shakes at other times during the day
(5), so this doesn’t perfectly isolate the greater protein intake as the main variable.
In addition, we also see studies showing huge lean mass gains from a massive bulking diet which included 3.3g/kg of protein per day
(17). The best part about this study is that participants didn’t even train! Two things can cause an increase in muscle protein synthesis (which is necessary for growth): food and training
(16). Therefore, optimizing both is necessary for maximum gains. The numbers from these studies probably represent some freedom for finding your optimal protein intake. Some people may grow great on 2.2g/kg, but others might have to bump it up a bit to see greater gains.