Eating sweet potatoes can supplement carbohydrates, dietary fiber and other nutrients. Sweet potato belongs to a common food in life, the nutritional value of sweet potato is relatively rich, which contains more rich in carbohydrates, dietary fiber, carotene, vitamins, as well as potassium, magnesium, copper, selenium, calcium and so on more than 10 kinds of elements, eating sweet potatoes can replenish the above nutrients. Secondly, due to the sweet potato contains dietary fiber is more, so in eating sweet potatoes generally will not lead to constipation, especially for the elderly is more suitable. Sweet potatoes also contain less fat and cholesterol, which will not increase the risk of increased blood lipids. However, the carbohydrate content of sweet potatoes is about 25%, and people who need to control their carbohydrate intake should eat in moderation. In addition, food can not replace the medication to play a therapeutic role.