The Study
Genetic Modulation of Lifespan: Dynamic Effects, Sex Differences, and Body Weight Trade-offs
This study is like watching a big group of mice grow up and tracking their genes, weight, and how long they live. It can show which genes are linked to living longer or shorter lives, but it can't prove those genes are the reason why. It's like noticing that people who wear red shoes tend to run faster — it doesn't mean the shoes make them faster.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
Scientists looked at thousands of mice to find genes that affect how long they live, and they discovered that some genes only matter at certain ages or in one sex. They also found that being heavier when young makes male mice live shorter lives, but being heavier when old means living longer.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 518 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1While mice aren't humans, the genes involved may work similarly, suggesting that timing and sex matter when studying aging and weight effects on longevity.
- 229 genes affect mouse lifespan in ways that change with age and sex.
- 3Male mice lose about 14 days of life for every extra gram of body weight when young.
- 419 genes link heavier young bodies to shorter lives (mostly in males), 11 link heavier older bodies to longer lives.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
bioRxiv
Year
2025
Authors
Danny Arends, D. Ashbrook, Suheeta Roy, Lu Lu, Zachary Sloan, Arthur G. Centeno, Kurt H. Lamour, J. de Magalhães, Pjotr Prins, Karl W. Broman, Ś. Sen, Sarah J Mitchell, Michael R MacArthur, Özlem Altintas Akin, Johan Auwerx, Amandeep Bajwa, Vivian Diaz, David E. Harrison, Randy Strong, James F. Nelson, K. Mozhui, Evan G. Williams, Richard A. Miller, Robert W. Williams
Related Content
Claims (6)
Your genes might play a role in when you die — not just from diseases, but in how long you naturally live.
In mice, the genes that affect how long they live work differently in males and females — many of the gene interactions are totally separate between the sexes.
In mice with different genes, scientists found 29 specific gene spots that affect how long they live — but these genes act differently depending on whether the mouse is young or old, and whether it's male or female. Some genes only matter at certain life stages, and some even switch from helping to hurting (or vice versa) as the mouse ages.
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.
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.
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.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.