The statement that four kinds of people cannot eat sweet potatoes is not true. Sweet potato, also known as sweet potato, belongs to coarse grains, carbohydrate content, accounting for 24.7%, is a better source of carbohydrates. Vitamins, sweet potatoes in the carotene content of 750mg/100g, in the same kind of food content of the front, can be used as a source of carotene supplementation. The general population can eat sweet potatoes in moderation, and there is no “four kinds of people can not eat sweet potatoes”. However, sweet potatoes contain high sugar content, not recommended for diabetic patients to eat a lot. In addition, there are gastrointestinal diseases of the crowd do not eat a lot of sweet potatoes. Diet should focus on nutritional balance, sweet potatoes can be combined with vegetables (lettuce, cauliflower, etc.) and meat (pork, beef, etc.) together.