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Onions have flavinoids and polyphenols (phytonutrients with flavinoids and tannins). Because of this, eating several servings of onions every week can lower your chances for getting certain types of cancer (colorectal, laryngeal and ovarian). Onions
Along with the vitamins Peter Flom has listed, they are also a good source of fiber. Nutrition Facts and Analysis for Onions, raw