Polyphenols can be broken down into subclasses, and in one BMC Medicine
study, researchers found that a higher intake of one subclass called stilbenes could extend your life span. You can find these potent polyphenols in Concord grapes. But if you can’t find the fresh fruit in the produce section, you can easily get your fix with 100 percent Concord grape juice, says Amy Gorin, M.S., R.D.N., owner of Amy Gorin Nutrition in Jersey City, New Jersey.
“These polyphenols help keep your heart healthy by promoting good circulation,” says Gorin. “One of my favorite ways to use the juice is in sauces for veggies, or as an ingredient in smoothie recipes.”