Good question. I'd say the ultimate vegetable is something from the green, leafy variety (lettuces, kale, swiss chard, collard greens, etc.). Why? Eaten fresh and often, they provide plenty of vitamins, minerals, fiber and other important elements. They can be eaten in all sorts of ways as they can be combined with savory and sweet foods in dishes. They are low-calorie yet nutritionally dense. They pack a punch for good health.