Chopped, sautéed, roasted, or caramelized . . . onions liven up the flavor of your foods and boost your cancer-fighting defenses.

The bonus: Onions are a low-calorie veggie bursting with flavonoids, vitamin C, and chromium. Why not make an-onion-a-day a habit? If teary eyes stop you, chill the onion before cutting. Stinky fingers a problem? Swipe your digits with a slice of lemon or a splash of vinegar. Bad breath? Nibble on parsley or apple slices. Or cook the onion first, to release some of the sulfur compounds.