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Athletes are more active and have very different goals with regards to nutrition compared to the average person. Athletes looking to maximize muscle mass and strength may benefit from protein levels well above the RdA. While the RdA focuses on minimum needs to achieve nitrogen balance, athletes should focus on consuming sufficient protein to maximize beneficial metabolic outcomes of greater protein intakes on a meal to meal basis. Current research suggests that the amino acid leucine is responsible for much of the anabolic properties of a meal and maximization of Mps in response to a meal is dependent upon consuming sufficient leucine (3g or ~0.05g/kg bodyweight) to saturate the mToR signalling pathway. The amount of protein required at a meal to achieve this outcome will differ based on the leucine content of the protein source with leucine rich protein sources like dairy, egg, meats and poultry being preferable to leucine poor sources of protein such as wheat. These leucine rich meals should be consumed multiple times per day and consumption of carbohydrate with free form essential amino acids ingested between whole protein meals may further optimize Mps, possibly by overcoming refractoriness.
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There are quite a few relevant studies, even of strength trainees in a deficit, and not a single one of them has found statistically significant benefits of consuming more than 1.6 g/kg protein. Nor is there a notable trend towards benefits. In fact, 1 study found detrimental body composition effects of going higher in protein. This research converges with several other studies in untrained subjects, nitrogen balance research and the body’s theoretical physiology to indicate that protein requirements are not higher in a deficit than when at maintenance or when bulking.