Eggplant     

This purple powerhouse is actually a berry, not a vegetable. And it’s a dieter’s dream, since it contains a measly 20 calories per cup, plus it’s low in sugar and high in muscle-strengthening protein and potassium. Eggplant is one of the main ingredients in the famous French dish, ratatouille, and it makes a great low-cal meat substitute in recipes like eggplant parmigiana. Try it grilled, baked, boiled, fried or sauteed.