Purple fruits and vegetables are rich in anthocyanins, which are natural plant pigments that provide foods with their unique color, registered dietitian Katherine Brooking writes for WebMD. Studies have shown that anthocyanins may benefit brain health, help to lower inflammation, and fight cancer and heart disease.Sep 12, 2017
Anthocyanins are a type of flavonoid, a class of compounds with antioxidant effects. Found naturally in a number of foods, anthocyanins are the pigments that give red, purple, and blue plants their rich coloring. In addition to acting as antioxidants and fighting free radicals, anthocyanins may offer anti-inflammatory, anti-viral, and anti-cancer benefits.
In herbal medicine, anthocyanin-rich substances have long been used to treat a number of conditions (including high blood pressure, colds, and urinary tract infections). Recent research suggests that anthocyanins may also help fend off major health problems, including heart disease and cancer.
(link)
I would add watermelon and pomegranate to the list.