Resveratrol: Xenohormesis, Sirtuins & the Dose Problem

Resveratrol is a stilbenoid polyphenol produced by grapes, blueberries, peanuts, and certain other plants in response to stress (fungal infection, UV exposure, drought). It became famous as the proposed explanation for the "French Paradox" — the observation that the French had relatively low cardiovascular disease rates despite high dietary fat intake, possibly due to red wine consumption.

Sirtuins & Longevity Research

Resveratrol activated SIRT1 (a sirtuin deacetylase linked to longevity and metabolic regulation) in early laboratory studies, generating enormous excitement. However, subsequent research revealed that resveratrol's sirtuin activation may have been partly an artifact of the assay used. Its effects on lifespan have been more modest in animal studies than initially hoped, though metabolic benefits (improved insulin sensitivity, reduced inflammation) appear more robust.

The Dose Problem

The doses used in many animal studies translate to amounts far exceeding what's achievable from wine or food. A glass of red wine contains roughly 1-2 mg of resveratrol, while many study doses in humans range from 150-500 mg. Furthermore, resveratrol has extremely poor oral bioavailability (less than 1% reaches systemic circulation unchanged), though its metabolites may be active.

Resveratrol is the classic example of xenohormesis — a plant stress compound that triggers beneficial stress responses in animals that consume it. For more on this concept, see the Hormesis page.