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Back to Study: Load-induced human skeletal muscle hypertrophy: Me...
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Strong Support

When muscles get bigger from working out, it’s not really because they’re storing more water or sugar—those changes don’t last or help much. What really matters is that the actual muscle fibers grow thicker.

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Evidence from Studies

Supporting (1)

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Load-induced human skeletal muscle hypertrophy: Mechanisms, myths, and misconceptions

Narrative Review
2025 Nov 21

This study says that muscles grow bigger mainly because the actual muscle fibers get thicker, not because they store more water or sugar — so the idea of 'puffy' muscle growth isn't real or lasting.

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No contradicting evidence found

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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

Load-induced human skeletal muscle hypertrophy: Mechanisms, myths, and misconceptions

Score: 1
DOI: 10.1016/j.jshs.2025.101104

Similar Assertions

When muscles get bigger over time, it’s not because the non-working parts inside them swell up—it’s because the actual muscle fibers that do the work grow more, and that’s what really matters.

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When muscles get bigger over time, it’s not because the non-working parts inside them swell up—it’s because the actual muscle fibers that do the contracting grow more, and that’s what really matters.

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When muscles get bigger over time, it’s not because they’re just storing more water or sugar—those things don’t stick around. Instead, muscles grow mainly by adding more of the actual contractile parts that make them strong.

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When muscles get bigger over time, it’s not because the non-working parts inside them swell up—it’s because the actual muscle fibers that do the work grow more, and that’s what really matters for lasting muscle growth.

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