We already know that the antioxidant plant compounds known as polyphenols are linked with better heart health. A new study lends additional support for the connection. In the study , published Nov. 27, 2025, by BMC Medicine , researchers evaluated the health and self-reported dietary information of more than 3,100 people (97% women, average age 52) who were then followed for an average of 11 years. The scientists measured each participant’s intake of 20 key polyphenol-containing foods to