Among 4,596 Health and Retirement Study participants followed a mean of 7.5 years (717 deaths over 34,583 person-years), the highest versus lowest quintile of total bioactive pigment intake carried a 37% lower mortality hazard (HR 0.63; 95% CI 0.48-0.81). Pigment diversity, quantified with Shannon entropy converted to Hill's effective numbers, showed a nearly identical association (HR 0.64; 0.49-0.82), and both held after mutual adjustment. Main contributors were tea, apples or pears, berries, peaches or plums, and dark chocolate; proanthocyanidins stood out among subclasses.
The mutual adjustment is the interesting part: variety appears to carry signal beyond sheer amount, echoing the "eat the rainbow" advice and prior diversity findings for fruit, vegetable and polyphenol intake. Plausible mechanisms include complementary anti-inflammatory, antioxidant and endothelial effects of flavonoids, anthocyanins and carotenoids. Caution is warranted, though. This is observational, with food-frequency data that misclassify intake, and healthy-user confounding is likely, since tea, berry and dark-chocolate consumers tend to be healthier overall. Residual confounding by income, education and overall diet quality cannot be excluded, and 7.5 years of follow-up in an older cohort raises reverse-causation concerns. Pigment quantity and diversity also track closely with fruit and vegetable intake generally, so the pigments may mark a good diet rather than act as independent drivers. Treat this as a confirmatory, hypothesis-strengthening finding rather than a paradigm shift. The practical takeaway is modest and low-risk: spread intake across many colorful plant foods rather than relying on a single supplement or superfood.
