BCAA

BCAAs, or branched-chain amino acids, are playing an increasingly important role in sports nutrition. They comprise three essential amino acids: leucine, isoleucine, and valine. Naturally present in muscle fibers, these compounds are particularly valued in training routines, especially intra-workout.

Classified as essential, these amino acids cannot be synthesized by the body. They must therefore be supplied through diet or by taking sports supplements. Today, BCAAs are available in a wide range of products, primarily as powder for dilution.

What are BCAAs?

BCAAs, or branched-chain amino acids, refer to three essential amino acids, including leucine, isoleucine, and valine. They play many roles in the body, particularly concerning proteins.

1. Essential Amino Acids and BCAAs

According to ANSES, "amino acids are the basic unit constituting proteins" (ANSES, 2013). Specifically, this means that the proteins we consume (and that our body uses to maintain and build muscle mass) are made up of chains of amino acids. Among the 20 amino acids present in human proteins, 9 are considered essential because the human body cannot synthesize them itself. They must absolutely be supplied through diet or supplementation.

BCAAs are among these essential amino acids, including leucine, isoleucine, and valine. They represent approximately 35% of the essential amino acids present in human muscle tissue, which explains their importance in sports nutrition.

2. A Unique Chemical Structure

BCAAs are called "branched-chain amino acids" because they possess, in their side chain, a branched aliphatic structure, meaning a carbon chain that has a bifurcation (a branch) rather than a simple linear structure.

It is this bifurcation that distinguishes BCAAs from other amino acids. Unlike other amino acids that have a simpler or linear structure, BCAAs have a more complex shape.

This specific chemical form directly influences their metabolism: BCAAs bypass the first phase of hepatic degradation (in the liver) that most other amino acids undergo. Instead, they are metabolized directly in skeletal muscles.

Where are BCAAs found naturally?

BCAAs are found in many complete protein sources, particularly in:

• animal products (meat, fish, eggs, dairy products),
• certain plant sources containing protein (soy, legumes, quinoa),
• and, of course, in dietary supplements such as whey protein. The latter is particularly popular among athletes for its high BCAA content.

However, in the context of intensive training or specific goals (muscle gain, cutting, endurance), targeted BCAA supplementation can be useful to increase the intake of these nutrients.

Difference between EAAs and BCAAs

In the world of sports nutrition, we often hear about both BCAAs and EAAs. Although both are essential for the body, they are not equivalent. Understanding their specificities allows for an informed choice regarding supplementation.

1. What are EAAs?

EAAs (Essential Amino Acids) are a group of nine amino acids that the human body cannot produce on its own. They must therefore be obtained exclusively through diet or supplements. EAAs include:

• Leucine
• Isoleucine
• Valine
• Lysine
• Methionine
• Phenylalanine
• Threonine
• Tryptophan
• Histidine

These amino acids work synergistically concerning many physiological functions.

2. What about BCAAs then?

BCAAs (leucine, isoleucine, valine) are actually a subgroup of EAAs, distinguished by their branched molecular structure and their direct muscle metabolism. They represent approximately 35% of the EAAs present in skeletal muscle.

3. Which one to choose?

• If the diet is balanced and rich in complete proteins, BCAA supplementation around training can be relevant.
• However, if the quality or quantity of protein intake is insufficient (veganism with a lack of protein, restrictive diets, periods of stress), then EAAs may be more complete.

When to take BCAA as a dietary supplement?

BCAAs can be consumed at different times of the day depending on the type of activity, intensity of training, or adapted nutritional strategy. Here are the three main times of consumption:

• Before training: BCAAs can be taken before a session, usually 30 to 45 minutes before the start of physical activity. This timing is often chosen for sessions without food intake, during a cutting phase, or for intense workouts.
• During training: It is possible to consume BCAAs during exercise, especially during long or demanding sessions. They can be mixed into a water bottle, to be drunk throughout the session.
• After training: BCAAs can also be consumed immediately after a session, as part of a post-workout snack or in addition to protein intake.

Available forms

BCAAs are available in several forms to suit everyone's preferences and consumption habits. Each format has specific characteristics in terms of practicality, taste, and mode of administration.

But the powder form is the most commonly used. It dissolves easily in water or an intra-workout drink. This format allows for customized dosing and is well-suited for quick consumption, especially before or during a session. Available in flavored or unflavored versions, it also offers good value for money for regular use.

How to choose your BCAA supplement?

The choice of a BCAA supplement should not be left to chance. For it to be effective, well-tolerated, and adapted to your athletic goals, several criteria must be taken into account. Here are the essential elements to consider before adding a BCAA to your routine.

1. Which ratio to prioritize?

- The 2:1:1 ratio (leucine : isoleucine : valine) is the most frequently found. It corresponds to the distribution naturally present in human muscles.
- Some formulas more concentrated in leucine, such as 4:1:1 or 8:1:1, also exist. These versions therefore emphasize leucine, due to its many benefits.

2. Formulation quality: purity and transparency

The quality of a BCAA supplement is also measured by the simplicity and clarity of its composition. It is recommended to choose products:

• without added sugars,
• without unnecessary fillers or excipients.

A supplement that is transparent about its composition inspires confidence, especially if you follow a precise nutritional program or if you have intolerances.

3. Certifications and quality controls: a guarantee of safety

Certifications are reliable indicators of quality. They guarantee that the supplement complies with strict standards regarding manufacturing, health safety, and regulatory compliance.

BCAA: In conclusion

BCAAs are branched-chain amino acids, comprising leucine, isoleucine, and valine, three essential amino acids. Their peculiarity lies in their branched molecular structure and their specific metabolism at the muscular level, which distinguishes them from other amino acids.

The body cannot produce them itself: they must therefore be supplied through diet or supplementation. Present in animal and plant protein sources, they are also widely available as dietary supplements, particularly in powder form.

Highly valued in disciplines such as bodybuilding, fitness, endurance, or strength sports, BCAAs are part of a targeted nutritional approach, especially during phases of intensive training, or dietary regimen (cutting, bulking).

Their choice must be based on precise criteria: balanced ratio, with a clear formula. Integrated into a balanced diet and an adapted sports routine, BCAAs can constitute a strategic lever to meet specific nutritional needs.

Sources:

1. Kaspy, M. S., Hannaian, S. J., Bell, Z. W., & Churchward-Venne, T. A. (2023). The effects of branched-chain amino acids on muscle protein synthesis, muscle protein breakdown and associated molecular signalling responses in humans: an update. Nutrition Research Reviews, 37(2). DOI: https://www.cambridge.org/core/journals/nutrition-research-reviews/article/effects-of-branchedchain-amino-acids-on-muscle-protein-synthesis-muscle-protein-breakdown-and-associated-molecular-signalling-responses-in-humans-an-update/9912227DD5144B0F7EB06260029520D7
2. ANSES. (2016). Les compléments alimentaires destinés aux sportifs.
3. ANSES. (2013). Les protéines.