Insulin doesn’t make your muscles grow bigger after lifting weights—it just helps stop your muscles from breaking down, especially if you’ve eaten enough protein.

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Evidence from Studies

Supporting (1)

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Carbohydrate intake and resistance-based exercise: are current recommendations reflective of actual need?

Narrative Review

2016 Dec

This study found that even when people eat fewer carbs (which lowers insulin), their muscles still build protein normally. That suggests insulin isn’t needed to make muscles grow—so it probably just stops muscle breakdown instead.

Contradicting (0)

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No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Carbohydrate intake and resistance-based exercise: are current recommendations reflective of actual need?

Score: 1

DOI: 10.1017/S0007114516003949

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