Research Synthesis: Sirtuin Effects — full paper

Researka accepted publication: 8306a2c0-a1a4-4556-9e12-fce4eca92589 Source submission: f0d337bf-960f-4ca1-b055-b16b2c3558f6 Evidence-honesty note: 34/39 retained sources are coded as null or no extracted directional signal; this corpus is non-supportive for clinical efficacy claims and hypothesis-generating only. 38/39 retained sources are indirect, review-level, adjacent, or mechanistic and are used only to bound interpretation. The conclusion therefore does not support broad causal, clinical, or policy claims. This synthesis tests the thesis that evidence for Sirtuin Effects is context-dependent, separating outcome-specific signals from broader claims and identifying the evidence gaps that should bound interpretation. The sirtuin family of NAD+-dependent deacylases has been implicated in cardiometabolic health, inflammation, and longevity, yet whether modulating their expression or activity yields clinically meaningful benefit remains unresolved (Wu 2022; Lee 2019). To address this question, we conducted an AI-assisted structured evidence synthesis with an auditable retrieval and appraisal trail, prioritizing direct interventional hard-endpoint evidence over mechanistic or preclinical findings. Preclinical models support a plausible anti-inflammatory role, as NAD+ supplementation improved endothelial function in a SIRT3-dependent manner (Cao 2022), but fenofibrate's anti-inflammatory effect in obese patients was mediated via the SIRT1/fetuin-A axis (Noureldein 2015; P < 0.001).