Watercress is a leafy salad vegetable loaded with potent phytochemicals. It is the richest known source of phenylethyl isothiocyanate, which is responsible for the characteristic peppery flavor and anti-cancer properties in the veggie. Iodine ranks high among the health-enhancing treasures in this food. Three ounces of watercress -- enough to fill a cereal bowl -- provides 10 percent DV of iodine.

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