Do carbs make your muscles grow bigger?
The Effect of Carbohydrate Intake on Muscle Hypertrophy: A Systematic Review and Meta-analysis.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Scientists looked at many studies where people lifted weights and ate different amounts of carbs—but kept protein and calories the same. They found carbs didn’t make muscles grow more.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 545 / 100
Evidence Score
The highest quality evidence. These studies systematically search, appraise, and synthesize results from multiple individual studies, providing the most reliable summary of current knowledge.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Scientists looked at many studies where people lifted weights and ate different amounts of carbs—but kept protein and calories the same. They found carbs didn’t make muscles grow more.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 545 / 100
Evidence Score
The highest quality evidence. These studies systematically search, appraise, and synthesize results from multiple individual studies, providing the most reliable summary of current knowledge.
Publication
Authors
Henselmans M, Vårvik FT, Izquierdo M
Related Content
Claims (5)
We can’t say for sure if carbs help build muscle — the data is too shaky. It might help a little, but we just don’t have strong enough proof yet.
Eating more carbs doesn’t make your muscles grow bigger when you’re already getting enough protein and calories — your muscles respond more to lifting weights than to how many carbs you eat.
Carbohydrate intake has no significant effect on muscle hypertrophy when protein and total energy intake are held constant.
Eating fewer carbs can make you feel fuller and eat less overall — which might make it harder to gain muscle because building muscle needs extra calories.
Most studies measure muscle growth by weighing your whole body and subtracting fat — but that includes water and fuel, not just muscle. That’s like measuring your car’s weight to see if the engine got bigger.