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Casey Butt's research has not specifically been replicated, but there have been numerous studies investigating the Fat-Free Mass Index of athletes from different sports—and they would appear to validate his findings. For example, a study of collegiate athletes found that they had an average height-adjusted Fat-Free Mass Index of 22.8 kilogram metres (kg.m), ...


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The literature consistently reports values of around 1.5-1.6 grams of protein per kilogram of body mass per day (g/kg/d) as being optimal for endurance, strength, and power athletes—with up to 2.0 g/kg/d being recommended for ultra-endurance and multi-sport athletes, or athletes in significant energy deficit. The latter figure is appropriate when training ...


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