Longevity & Aging · Diets
sirtuins enables caloric-restriction lifespan extension
In plain terms: Do sirtuins, the so-called 'longevity' proteins, explain why eating less extends life?
Part of: • Aging
Unclear — evidence is mixed, only in yeast and worms, and a careful study saw it largely vanish.
🧭 Read this score with how it was built in mindLab and animal results no longer outvote a human study that found nothing
Nine yeast, worm and mouse studies support it; the human-relevant analysis argues sirtuins are not conserved longevity genes across species.
📅 Last reviewed: 2026-07-14 ⓘ
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: Population patterns (Observational)
How the studies fall
What the evidence shows
Foundational yeast/worm support (Guarente lab) that SIR2/SIRT1 mediate CR longevity, but the strong causal form is contested: Burnett 2011 found the prior overexpression effects collapse on controlled genetic backgrounds and DR can work independently of Sir2.
The evidence (14)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Bruner KR, Byington IR, Marx TJ, Vasileva A, Fletcher T, Ghimire S, Zappia IJ, Shaju Y, Zeng J, Wachsmuth HR, Carlyon TW, Besselsen DG, Drucker DJ, Duca FA, Stern JH 2025 · Geroscience | mechanism | tested-null | low | Glucagon-receptor signaling was indispensable for the healthspan benefits of caloric restriction — identifies a NON-sirtuin mediator of CR benefits, arguing sirtuins are not the sole/necessary mediator (mixed for the sirtuin-mediation claim). |
| Wu LE, Fiveash CE, Bentley NL, Kang MJ, Govindaraju H, Barbour JA, Wilkins BP, Hancock SE, Madawala R, Das A, Massudi H, Li C, Kim LJ, Wong ASA, Marinova MB, Sultani G, Das A, Youngson NA, Le Couteur DG, Sinclair DA, Turner N 2023 · Aging Cell | animal | contradicts | moderate | SIRT2 transgenic overexpression did NOT impact lifespan in normal mice (benefit only in a progeria model) - undercuts sirtuins as general longevity mediators. |
| Rogina B, Tissenbaum HA 2024 · Front Genet | observational | supports | low | Review by a sirtuin proponent: SIRT1/resveratrol links to CR and aging, but acknowledges contested resveratrol/SIRT1 lifespan data - net supportive-but-qualified. |
| Lin SJ, Defossez PA, Guarente L 2000 · Science | animal | supports | moderate | CR-induced lifespan extension in yeast requires SIR2 and NAD synthesis (NPT1) |
| Yang H, Baur JA, Chen A, Miller C, Adams JK, Kisielewski A, Howitz KT, Zipkin RE, Sinclair DA 2007 · Aging Cell | animal | supports | low | Designed STAC compounds activating Sir2 extended yeast replicative lifespan, reinforcing the sirtuin-activation route to lifespan extension (in-vitro/yeast). |
| Maissan P, Mooij EJ, Barberis M 2021 · Biology (Basel) | mechanism | supports | low | Systematic review: sirtuin activity extends lifespan across organisms via NAD+-dependent regulation at the metabolism/cell-cycle interface (supportive synthesis). |
| Tissenbaum HA, Guarente L 2001 · Nature | animal | supports | moderate | Extra copy of sir-2.1 extends C. elegans lifespan up to 50%, upstream of daf-16 |
| Wu P, Vandemeulebroucke L, Guiritan KRA, Braeckman BP 2025 · J Gerontol A Biol Sci Med Sci | animal | supports | moderate | C. elegans axenic dietary restriction: large lifespan extension shown to genetically require sir-2.1 — direct evidence sirtuins mediate a caloric/dietary-restriction longevity effect (invertebrate). |
| Qu Q, Chen Y, Wang Y, Wang W, Long S, Yang HY, Wu J, Li M, Tian X, Wei X, Liu YH, Xu S, Xiong J, Yang C, Wu Z, Huang X, Xie C, Wu Y, Xu Z, Zhang C, Zhang B, Feng JW, Chen J, Feng Y, Fang H, Lin L, Xie ZK, Sun B, Tian H, Yu Y, Piao HL, Xie XS, Deng X, Zhang CS, Lin SC 2025 · Nature | animal | supports | high | Lithocholic acid (accumulated during CR) binds TULP3 to activate sirtuins and AMPK and slow ageing in mice - recent mechanistic support linking CR to sirtuin activation. |
| Lin SJ, Ford E, Haigis M, Liszt G, Guarente L 2004 · Genes Dev | animal | supports | moderate | CR extends yeast replicative lifespan by lowering NADH and activating the NAD-dependent deacetylase Sir2 - core mechanistic support for sirtuin-mediated CR longevity. |
| Wood JG, Rogina B, Lavu S, Howitz K, Helfand SL, Tatar M, Sinclair D 2004 · Nature | animal | supports | moderate | Sirtuin-activating compounds (STACs) mimicked CR and delayed ageing in yeast, worms and flies in a Sir2-dependent manner, supporting sirtuins as CR effectors. ⚠️ correction-on-file (Crossref) - kept, corrigendum not retraction |
| Brenner C 2022 · Life Metab | observational | contradicts | moderate | Argues sirtuins are NOT conserved longevity genes; cross-species lifespan claims fail the conservation test - directly contests the CR-sirtuin thesis. |
| Burnett C, Valentini S, Cabreiro F, Goss M, Somogyvári M, Piper MD, Hoddinott M, Sutphin GL, Leko V, McElwee JJ, Vazquez-Manrique RP, Orfila AM, Ackerman D, Au C, Vinti G, Riesen M, Howard K, Neri C, Bedalov A, Kaeberlein M, Soti C, Partridge L, Gems D 2011 · Nature | animal | contradicts | high | With controlled genetic background, Sir2 overexpression does NOT extend lifespan in worms/flies; DR works independently of dSir2 |
| Moroz N, Carmona JJ, Anderson E, Hart AC, Sinclair DA, Blackwell TK 2014 · Aging Cell | animal | supports | moderate | Dietary restriction acted through NAD+-dependent (sirtuin) mechanisms and an oxidative-metabolism shift, supporting sirtuin involvement in DR longevity (independent lab). |
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