Dietary polyphenol intake and all-cause mortality: a meta-analysis of cohort studies

Researchers combined results from several cohort studies, which follow people over time. The studies compared adults who consumed more or fewer polyphenols, natural chemicals found in foods such as berries, tea, coffee, vegetables, and whole grains. They looked at all-cause mortality, meaning death from any cause. People with higher polyphenol intake generally had a lower risk of dying during follow-up. These studies can show a link, but they cannot prove polyphenols caused the difference.

What this means for you: Eating a varied diet rich in plant foods is a reasonable choice, but this study does not prove that polyphenol supplements or one specific food will extend life. Focus on overall diet quality rather than chasing a precise polyphenol target.