# Polyphenols

Polyphenols are a huge, diverse group of plant compounds, over 8,000 of them. They are all built around aromatic rings carrying hydroxyl groups. The major subclasses include flavonoids (quercetin, catechins, anthocyanins), stilbenes (resveratrol), phenolic acids, and lignans. At the levels you actually get from food, they work less as direct antioxidants. Instead, they act more as mild stressors that switch on your defenses. They activate Nrf2, AMPK, and SIRT1. That triggers mitochondrial biogenesis, autophagy, and anti-inflammatory programs (a 'xenohormetic' effect). At least 62 polyphenols have extended lifespan or improved aging markers in lab organisms. In humans, a 2024 meta-analysis of seven cohorts (178,657 people) tied higher intake to a 7% lower risk of death from all causes. And a 2024 review of trials (Mekhora, Lamport and Spencer) found supplements improved verbal memory and executive function. They also lowered the inflammation marker interleukin-6, though the effects were modest. The big catch is bioavailability. Most polyphenols absorb poorly and get heavily processed on first pass through the liver. So they reach your blood at low levels. Your gut microbes strongly shape how much converts into the active forms (aglycones and urolithins). There is no proof yet that polyphenols extend human lifespan. So the evidence supports polyphenol-rich diets, not isolated high-dose pills.

## Sources

- Proshkina E, Koval L, Platonova E, Golubev D, Ulyasheva N, Babak T, Shaposhnikov M, Moskalev A. (2024). Polyphenols as Potential Geroprotectors. Antioxidants & Redox Signaling. https://doi.org/10.1089/ars.2023.0247
- Xu W, Luo Y, Yin J, Huang M, Luo F. (2023). Targeting AMPK signaling by polyphenols: a novel strategy for tackling aging. Food & Function. https://doi.org/10.1039/d2fo02688k
- Scalbert A, Williamson G. (2000). Dietary Intake and Bioavailability of Polyphenols. The Journal of Nutrition. https://doi.org/10.1093/jn/130.8.2073s
- Mekhora C, Lamport DJ, Spencer JPE. (2024). Effect of polyphenols on inflammation related to cognitive function: a systematic review and meta-analysis of human randomized controlled trials. Nutrition and Healthy Aging. https://doi.org/10.3233/NHA-240006
- Zupo R, Castellana F, Lisco G, Corbo F, Crupi P, Sardone R, Panza F, Lozupone M, Rondanelli M, Clodoveo ML. (2024). Dietary Intake of Polyphenols and All-Cause Mortality: A Systematic Review with Meta-Analysis. Metabolites. https://doi.org/10.3390/metabo14080404

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_Canonical: https://longevity-switzerland.com/en/glossary/polyphenols · Part of Longevity Cities · Updated 2026-06-22_