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Hey Girls, Welcome to the first post on sports nutrition supplements. We’re starting with one of the most controversial supplements on the market currently, BCAA’s.

What are BCAA’s

BCAA is short for Branched Chain Amino Acid. Amino Acid’s are the building blocks of protein and BCAA’s are three of those building blocks. The branched chain part refers to the structure of the amino acids. The three BCAAs are Leucine, Isoleucine and Valine. BCAAs are all essential amino acids meaning we need to get them from our diet as the body cannot create them from other amino acids. Dietary sources of BCAA include meats, fish and eggs, however, supplementation has become popular in recent years.

One of the reasons for supplementing is that they are broken down and used during exercise (especially leucine). When you’re in a carb depleted state, which is usually after waking up and after long periods of exercise. the muscle uses BCAA with other substates to form alanine which then goes to the liver to be converted into glucose which we humans use as our main source of energy. If the branched-chain aminos are not available in the blood, the breakdown of protein happens to get these BCAAs. Sometimes from muscle tissue.

BCAA can also be used by the muscles for fuel during exercise and may help you avoid mental fatigue, this is because Tryptophan (another amino acid which is used in the process of making serotonin – sleep hormones) and BCAA compete for entry into the brain, if you can reduce the amount of trytophan entering the brain by intaking branched-chain aminos this can have a positive effect on your mental fatigue (which plays a huge role in your performance).

The Facts

  • The uptake increases during exercise
  • During exercise we are in a catabolic (breaking down) state
  • We need at least 5g of Leucine to stimualte muscle protein synthesis
  • We need more than just 3 amino acids for muscle protein synthesis
  • Muscle Protein Synthesis is an anabolic (building up) process which cannot take place until catabolic activites (exercise) finish
  • 2:1:1 ratio is ideal
  • 6-15g taken before exercise may improve recovery by lessening the amount of muscle breakdown during exercise

What does the research on BCAA supplementation say:

The research is very mixed and there’s alot out there. Having adequate protein in your diet is more important for buidling lean muscle (and toning up) than supplementing with BCAA. However, for recovery (less muscle break down during exercise) and performance (less fatigue and a supply in the blood without having to break down muscle) this supplement can be helpful! And better performance = better results! Theres no harmful side effects associated with BCAA so if your budget can afford you it then go for it, just be wary of the brand you buy as not all of them are worth the money! And I’d reccomend ensuring your daily protein intake is adequate first, as is your daily nutrition before investing in any supplement.


If you have any questions regarding BCAA’s leave a comment below or send me a DM on instagram @thefitgirlrules. You can find the rest of my sport’s nutrition posts here

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