Not all comfort food is bad for you. Sweet potatoes are a nutritional powerhouse — so much so that the nutrition scientists at the Center for Science in the Public Interest (CSPI) rank the orange tuber number-one in good-for-you vegetables. The reason? For starters, they’re loaded with carotenoids, antioxidants that have been associated with a lower risk of death from heart disease, cancer and other diseases. Sweet potatoes are also chock-full of fiber, which helps keep their glycemic index lower than all other root vegetables.