Think of the typical toppings on your baked potato -- butter, sour cream, maybe cheese and bacon bits. If you substitute a sweet potato, you might not need any of that. Baked sweet potatoes are so full of flavor, they don't need a lot, unless you want to try a sprinkle of cinnamon. This can save you loads of calories. As a bonus, sweet potatoes are packed with potassium, beta-carotene, vitamin C, and fiber.