Broccoli
Broccoli is America's favorite vegetable, according to a recent poll. No wonder. A cup of cooked broccoli has a mere 44 calories. It delivers a staggering nutritional payload and is considered the number one cancer-fighting vegetable. It has no fat, loads of fiber, cancer fighting chemicals called indoles, carotene, 21 times the RDA of vitamin C and calcium. When you're buying broccoli, pay attention to the color. The tiny florets should be rich green and free of yellowing. Stems should be firm.