” Prunes top the list with more than twice the level of antioxidants than other high-scoring fruits such as blueberries and raisins. (…) While antioxidant vitamin supplements have grown in popularity, it may be the combination of the nutrients in the foods that have the greatest effect. (…) This isn’t the first research indicating prunes, which are dried plums, are high in antioxidant compounds. Researchers at the University of California, at Davis, found that prunes contain high amounts of neochlorogenic acid, a phenolic compound, and a strong antioxidant. In addition, prunes are fat and cholesterol-free and are a delicious way to add fiber, vitamins and minerals to meet your dietary requirement of five fruits and vegetables a day.” 

— Michele Sloat  Prunes Score Highest in Antioxidants That May Slow Aging Process