Case reports on well-trained bodybuilders: Two years on a high protein diet

The purpose of these case studies was to further assess 5 subjects who consumed a high protein diet over an additional 12-month period (for a total of 2 yrs) in order to determine if there were any adverse effects on kidney or liver function. Five healthy resistance trained men (mean ± SD; age 30 ± 5 yrs; height 177.9 ± 5.5 cm) volunteered to consume a high protein diet (>2.2 g·kg^-1·d^-1) over another 1-yr period. They had previously participated in a 1-yr high protein diet study. The subjects came to the lab every 6 months to assess body composition via the Bod Pod®. Body mass, fat mass, lean body mass (LBM), and body fat percentage were ascertained. The subjects provided dietary selfreports via the MyFitnessPal® mobile app at least 3 times·wk^-1. No other instructions were given. All subjects were provided protein powder so they could attain their protein intake goals. A comprehensive metabolic panel was done in a fasted state at a local Quest Diagnostics facility every 6 months. The findings indicate that 2 yrs of a high protein diet in healthy resistance trained men had no effect on measures of body composition as well as liver or kidney function. Thus, there is no evidence to suggest that consuming a high protein diet over a 2-yr period causes any harmful side effects.