Heavier male mice had larger lifespan gains from interventions
For weight-lowering interventions, median lifespan gains over controls rose from 6.2% in the lightest quarter of males to 20.2% in the heaviest.
Our read
Interventions- Studied:
- Preprint: experiments in 33,780 mice allowed to eat freely, against male mice in lightest weight quartile
- What changed:
- With weight-lowering interventions, male mice's median lifespan gains over controls rose from 6.2% in the lightest quarter to 20.2% in the heaviest
- The catch:
- Poor control health could inflate apparent lifespan benefits in heavier mice
- In the record:
- One of 1,699 papers on body weight on record: 181 with results in people, 18 in animals.
Editor of record: Boris Djordjevic · AgingResearch.News
Among 33,780 mice allowed to eat freely, an analysis of Interventions Testing Program data examined whether body weight was linked to the lifespan effects of experimental interventions. In males, heavier adult weight was associated with more favorable intervention effects, especially for interventions that lowered weight.
For those interventions, median lifespan gains over controls rose from 6.2% in the lightest quarter by weight before dosing to 20.2% in the heaviest. This mainly reflected a steeper decline in control survival with higher weight. The weight pattern was consistent across 13 of 14 compounds and reflected weight reached during adulthood rather than early life. The link between weight and intervention effects was weak in females.
Why it matters
Lifespan-extending interventions may have less apparent benefits in metabolically healthier mice or humans, the authors suggest.
Caveats
Comparing mice by weight leaves open whether weight itself or other differences between lighter and heavier mice accounted for the pattern. The findings are from a preprint that has not been peer-reviewed.
The paper
Body weight modifies the efficacy of lifespan-extending interventions in ad libitum-fed mice
University College London
bioRxiv, Nov 11, 2026, Open access, CC BY-NC-ND, Preprint, not yet peer-reviewed
Comments
Be the first to comment.