Nutritional Benefits of Sweet Potatoes One cup of sweet potatoes contains six grams of fiber, and over 700% the daily value of vitamin A. They’re also a great source of vitamin C, manganese, B6, and potassium. Sweet potatoes are also rich in antioxidants, which protect the body from free radicals. Excess free radicals in the body can lead to chronic diseases like cancer, heart disease, and premature aging. Eating more foods rich in antioxidants, like sweet potatoes, can help reduce the risk of chronic disease and inflammation in the body. The fiber in sweet potatoes can help keep the digestive