Sweet potatoes, also known as sweet potatoes, groundnuts, yams, sweet potatoes, etc., were introduced to China in the 16th century, and have been cultivated for less than 500 years. Sweet potato taste sweet, nutritious, and easy to digest, can supply a lot of heat energy, so some areas take it as a staple food. Sweet potato is Hainan “rice”, coastal fishing villages used to sweet potato as the main food. Nutritional composition] sweet potato carbohydrate content is high (23.1%), containing high caloric energy (100 grams of fresh sweet potato can produce 99 kcal), but does not contain fat. In addition, sweet potato is also rich in dietary brazing dimension, bioflavonoids, vitamin C, vitamin A, vitamin Bl, potassium, carotene and other nutrients. (1) Sweet potato can prevent cholesterol from being deposited on the walls of blood vessels, helping to prevent or alleviate cardiovascular diseases. (2) Sweet potato contains unique bioflavonoids, and can promote smooth defecation, can effectively inhibit the occurrence of breast cancer and colon cancer. (3) Sweet potatoes can improve the function of digestive organs, nourish the liver and kidney, and have a restorative effect on the weakening of the organism, as well as effectively treating hepatitis and jaundice. Sweet potatoes are eaten as a fleshy root, and there are many ways to eat them, such as boiling them directly or making them into dry snacks. The most well-known ways to eat sweet potatoes are sweet potato water, simmered sweet potatoes and sweet potato porridge. Dissolve sweet potato flour in milk or soy milk to drink, is suitable for the elderly and children to eat. (1) Consumption of cold sweet potatoes can easily lead to stomach and abdominal discomfort. Sweet potatoes produce acid in the stomach, so stomach ulcers and patients with excessive stomach acid should not eat. (2) Rotten sweet potatoes (sweet potatoes with black spots) and sprouted sweet potatoes can be poisonous and should not be eaten. (3) Sweet potatoes and other root vegetables contain a lot of starch, which can be processed into vermicelli for consumption, but alum is often added during the production process. If too much consumption will lead to aluminum accumulation in the body, is not conducive to health. (4) sweet potato contains “gasification enzyme”, do not eat too much at a time, and rice and noodles with food, and with salted vegetables or drink some vegetable soup to avoid heartburn, spit acidic water, bloating and exhaust gas and other phenomena. Amount to be consumed] 1 per serving (about 150 grams).