Few foods can hold a candle to this leafy green. Kale is full of vitamins, minerals and health-enhancing antioxidants. Indeed, kale's filling fiber, bone-building calcium and heart-healthy omega-3 fatty acids have been shown to help support the body’s natural detox system, getting rid of harmful compounds that are thought to cause cancer, heart disease and other serious ills. And what a bargain it is too, at just about 60 cents a cup. Plus, kale is easy to prepare. Simply remove the center ribs of its leaves, then slice it into thin ribbons. Add this healthful pick to soups and stews in the last 20 minutes of cooking, or sauté it with a splash of olive oil for a delicious side dish.