Cysteine reduction, not methionine restriction, linked to survival in aging mice and worms
In this abstract, selective cysteine restriction extended lifespan in worms and, in Cth-deficient mice, 70% cysteine reduction improved healthspan, while methionine restriction with normal cysteine was ineffective. [1]
Automatic summary · not editorially reviewed
The key findings
In Caenorhabditis elegans, selective cysteine restriction enhanced lifespan and stress survival independently of methionine. [1]
Traditional methionine-restriction diets also lack cystine, leaving unclear which sulfur-containing amino acid controls aging. [1]
In aged Cth-deficient mice, sustained 70% cysteine reduction reprogrammed the immunometabolic axis and conferred healthspan benefits. [1]
The source at a glance
- Study type / format
- Preclinical animal study (abstract)
- Population / context
- Caenorhabditis elegans and Cth-deficient mice, including aged mice
- Summary based on
- Study abstract
- Publication status
- Preprint · peer-review status not confirmed
- Original publication
- September 9, 2026
Cysteine versus methionine in worm lifespan
The abstract notes that traditional methionine-restriction diets also lack cystine, so it was unclear which sulfur-containing amino acid controls aging. In Caenorhabditis elegans, selective cysteine restriction enhanced lifespan and stress survival independently of methionine. This is a preclinical worm result, not evidence of a human lifespan benefit.
Supporting source [1]
Cysteine-free diets in Cth-deficient mice
In Cth-deficient mice, cysteine-free diets with methionine either replete or restricted induced pro-metabolic effects, whereas methionine restriction with normal cysteine was ineffective. Sustained 70% cysteine reduction in aged Cth-deficient mice reprogrammed the immunometabolic axis and conferred healthspan benefits. These are animal findings; the abstract does not report human outcomes.
Supporting source [1]
Scope of the cysteine-reduction abstract
The abstract concludes that lowering cysteine while keeping the methionine pool intact enhances healthy lifespan. It reports worm and mouse experiments but no human trial, sample sizes, follow-up durations or effect sizes. The full text was not reviewed, so details of design and statistics remain unknown.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. Worm and mouse experiments are reported without human data, sample sizes, follow-up or effect sizes.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Orliaguet L, Kim H, Gupta P, Lee A, Lei Y, Li R, Zeng C, Youm Y, Dlugos T, Guan C, Wang A, Artyomov MN, Kluger Y, Schumacher B, Dixit VD. · europepmc.org · September 9, 2026