Facts about the human body.

The body produces human growth hormone at an extraordinary rate when you are working out fasted. Yes, just by taking BCAA's will stunt the growth hormone.

But if you do have food, I would make it liquid meals that are low carb because if you eat solid food, you’ll spike your insulin and lose out on any benefits of the fasted workout experience.

Worse yet, you will be digesting food, which is not good when you are pushing your body beyond its current limits physically. Digestion alone takes a tremendous amount of energy to undergo, but add working out while digesting, then your workout and digestion suffer. —It is best to do one then the other. Workout, rest thirty minutes to an hour, then eat your big meal and then rest some more.

If you’ve never worked out fasted, I would take it slowly and ease into it. Start with liquid, once you feel great doing liquid switch to pure BCAA’s. Once you feel comfortable with pure BCAA’s then lower the amount until you can workout fasted.