They’re low in calories, high in fiber, and loaded with essential micronutrients, such as manganese and vitamins C and K ( 3 ).
What’s more, test-tube studies indicate that concentrated elderberry extracts may fight the flu virus and prevent it from infecting cells, though this is still under investigation (20, 21 ).
Summary Blue tomatoes are grown to be rich in anthocyanins while retaining high amounts of other beneficial plant compounds that have been associated with a reduced risk of heart disease, stroke, and prostate cancer.
Research suggests that diets high in anthocyanins may promote heart health and reduce your risk of obesity, type 2 diabetes, certain cancers, and other diseases ( 2 ).
Though more research is needed, some studies show that Concord grapes and their juice may boost your immune system ( 28 ).
For example, one 9-week study that had people drink 1.5 cups (360 ml) of Concord grape juice daily observed increases in beneficial immune cell counts and blood antioxidant levels, compared with a placebo group ( 29 ).
Plums also contain certain plant compounds and a type of sugar alcohol called sorbitol, which may help loosen your stools and promote more frequent bowel movements as well ( 42 ).
Summary Blackberries are loaded with fiber, manganese, and vitamin C. They’re also one of the few fruits that are high in vitamin K, which plays an essential role in blood clotting and bone health.
These delicious berries are also high in anthocyanins, which are potent antioxidants that help defend your cells against harm from unstable molecules called free radicals ( 4 , 5 , 6 ).
Blue fruits get their vibrant color from polyphenols, though these plant compounds provide more than just a burst of color. Here are 7 delicious blue fruits with powerful health benefits.