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Another subclass of polyphenols you should pay attention to are lignans. They can be found in flaxseed and have also been linked to decreased mortality rates.

Nutrition pros approve of flaxseed for its ability to help reduce inflammation, balance hormones, protect against mood swings and depression, and prevent heart disease and diabetes. The combination of polyphenols and an abundance of omega-3 fatty acids make flaxseed a nutritional powerhouse for cardiovascular health, says LeeAnn Smith Weintraub, R.D., M.P.H., of Los Angeles. "To get the greatest benefit, consume ground flaxseed and keep it refrigerated."

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You probably already know that walnuts top the list of good-for-you nuts thanks to their heart-healthy omega-3s. But what really makes these nuts reign supreme is their antioxidant value—walnuts ranked higher than any other nut tested for quality and potency of polyphenols, according to research from the University of Scranton. "Walnuts have been shown to help reduce inflammation in the body, which could reduce disease risk," says Gorin.

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Concord Grapes

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."

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What Are Polyphenols?

You likely know all about antioxidants already—they help increase cell turnover, which speeds up healing and slows signs of aging. But what about polyphenols?

Polyphenols are a specific type of antioxidant derived from plant compounds. During digestion, your body transforms polyphenols into viable antioxidants.

There are a wide variety of polyphenols found in foods such as tea, wine, chocolate, fruits, vegetables, and extra-virgin olive oil, according to research in the International Journal of Molecular Sciences. But how do you reap the most benefits? Here, we share some of the top polyphenol-rich foods, so you know what to grab on your next grocery run.

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Here's Why I'll Never Tell Anyone to Stop Wearing Makeup

If you're even somewhat in touch with the world of beauty, you know that the #NoMakeup movement has become a powerful force. Started by celebs like Alicia Keys and Alessia Cara who have gone makeup-free on the red carpet, the trend is all about pushing women to embrace their so-called flaws. If you need further proof it's a real thing, today has actually been declared National No Makeup Day!