The dietary fiber and anthocyanins in blueberries have the potential to influence the gut microbiome and metabolites relevant to depression in older adults https://medicalxpress.com/news/2026-09-blueberries-gut-microbiome-older-adults.html Daily blueberry intake modulates the gut microbiota in older adults https://www.sciencedirect.com/science/article/pii/S1279770726001910