Branched chain amino acids are the building blocks of protein and can be a very useful supplement for those who are dieting and cutting calories. When you are in a caloric deficit your body is constantly catabolizing stored fats, carbohydrates, and believe it or not muscle! Preserving your hard earned muscle mass while trying to shed fat is a huge challenge. BCAA supplements will help you preserve more muscle mass and can offset fatigue while dieting.
As we get leaner our bodies try harder and harder to hold onto fat stores. As a result muscle is broken down to be used as energy and overall protein synthesis decreases. This is not good for muscle recovery or our lean tissue because protein synthesis is how we heal muscles after a workout and create new tissues. You can use BCAAs to combat this. BCAAs will actually boost protein synthesis and inhibit the breakdown of muscle for fuel.
Branched chain amino acids can also help to increase your workout intensity by offsetting fatigue. BCAAs compete with tryptophan for entry to the brain. Once in the brain, tryptophan can be converted to serotonin, and rising serotonin levels along with other factors will contribute to your perception of fatigue during a workout.