Onions
(Marek Mnich/iStockphoto)
A cup of chopped onions only contains 60 calories and using them in stir-fries, soups and casseroles is a great way to integrate the plant chemical quercetin into your diet. Quercetin has been found to have "anti-inflammatory and antioxidant properties," according to the American Cancer Society, and may prove to be protective "against a wide variety of diseases, including cancer."

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