It is because it contains rich nutrients. According to chemical analysis, each kilogram of sweet potato contains 256 grams of sugar, 15 grams of protein, 156 milligrams of calcium, 174 milligrams of phosphorus and a variety of vitamins, especially the carotene content is extremely rich, is the best of the food and vegetables.

The second is because it contains a mucin with a special function. This mucin can not only maintain the elasticity of the human cardiovascular wall, prevent atherosclerosis from occurring, reduce subcutaneous fat, prevent connective tissue atrophy in the liver and kidneys, and prevent collagen disease, but also on the respiratory tract, the digestive tract, the joint cavities and the plasma membrane cavity has a very good lubricating effect.

Third, the groundnut is rich in dietary fiber and gelatinous substances such as defecation, can be described as "intestinal scavenger".

Fourth, it is a physiological alkaline food, with meat, eggs, rice, noodles and the acidic substances produced by the neutralization, regulating the body's acid-base balance, the maintenance of human health has a positive significance.

Sweet potato is a kind of cheap and beautiful fitness and longevity food, but because it contains oxidative enzymes and crude fiber, in the human stomach and intestines will produce a large amount of carbon dioxide gas; because of its high sugar content, eat more than in the stomach will produce acid, causing bloating, heartburn and other symptoms. Therefore, eating sweet potatoes should pay attention to science. Can not eat too much at a time, try to use fine processing, and the best with rice, noodles with food, in order to reduce the production of stomach acid, to prevent bloating, heartburn and other symptoms.