In male mice, being heavier as a young adult is linked to a shorter life — each extra gram might take away up to 14 days. This effect is much stronger in males than in females, suggesting their genes handle weight and aging differently.

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Pro

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Evidence from Studies

Supporting (1)

18

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18

Genetic Modulation of Lifespan: Dynamic Effects, Sex Differences, and Body Weight Trade-offs

Cohort Study

Animal

The study found that male mice that weigh more when they're young tend to live shorter lives, and this link is stronger in males than females, which matches the claim.

Contradicting (0)

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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

Genetic Modulation of Lifespan: Dynamic Effects, Sex Differences, and Body Weight Trade-offs

Score: 18

DOI: 10.1101/2025.04.27.649857

Similar Assertions

Scientists gave male mice a special form of estrogen and they lost weight, but that weight loss didn't make them live longer - female mice also lost weight but didn't get any lifespan benefit from it.

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In mice, certain genes seem to link being heavier early in life to a shorter life, especially in males — but being heavier later in life is actually linked to living longer, showing that the effect of weight on lifespan changes with age and sex.

18

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In older male mice, genes play a bigger role in how long they live — by the time they reach super old age, about half the reason one lives longer than another comes down to their DNA, not their environment.

18

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