Nutrition · Moderate evidence
Isolated BCAAs Do Not Build Muscle
Branched-chain amino acids on their own do not sustain muscle protein synthesis; whole dietary protein fills this role.
Narrative review · 1 source · 2 min
What the studies show
- Isolated BCAAs do not supply the other essential amino acids required to build protein.
- The anabolic response is greater with whole protein.
- Individuals who already hit their daily protein target do not need BCAAs.
How Letz applies it
When the question comes up, the coach redirects focus toward the daily protein target instead of recommending a supplement.
Who it applies to
Adults considering amino acid supplementation.
Limits
This is a mechanistic review, not a long-term trial.
Sources
- Wolfe, Journal of the International Society of Sports Nutrition, 2017 DOI 10.1186/s12970-017-0184-9
More in Nutrition
- Protein and Training AdaptationSufficient protein can support gains in lean mass and strength alongside training; the response varies and does not increase indefinitely with higher intakes.
- Higher Protein Intake During a Calorie DeficitIn a deficit, higher protein protects lean mass and can even allow muscle gain alongside intense training; the effective range rises to approximately 1.6 to 2.4 g/kg.
- Rate of weight lossLosing weight slowly, at around 0.5 to 1% of body weight per week, better preserves lean mass, strength, and metabolic rate compared to rapid weight loss.
- Distribute protein throughout the dayDividing protein into servings of around 0.4 g/kg across four or more meals stimulates protein synthesis more than concentrating everything into one or two.