BCAA supplements are widely used by fasted trainees to reduce accelerated muscle protein breakdown during fasted exercise without consuming any calories . However, research clearly shows that the amino acids in BCAA supplements (leucine, isoleucine, and valine) most definitely do contain calories . .
Each amino acid contains around 6 calories per gram. This would mean that each serving in a typical BCAA supplement contains around 50 calories. This isn't shown on the supplement label because the FDA doesn't obligate the supplement manufacturers to declare the caloric content of a product that only contains individual amino acids . .
A good alternative of BCAA's for fasted trainees may be an HMB supplement, as there's research suggesting it can reduce muscle protein breakdown in trained individuals and a serving of HMB generally contains fewer calories (~12 calories per serving) than a serving of BCAA's [4, 5]. .
This is a follow-up of a post I made about BCAA's last week ☺. .