Sweet potato contains protein, starch, amino acids, pectin, dietary fiber and other vitamins and minerals, as well as more than ten kinds of trace elements such as calcium, iron, copper, selenium and potassium. Sweet potato contains a lysine substance, but rice and flour just lack this lysine. Eating sweet potatoes with rice noodles can fully supplement protein. Sweet potato contains a lot of dietary fiber, which cannot be digested and absorbed in the intestine. Can stimulate the intestine, enhance peristalsis and promote defecation. Sweet potato is famous for its low calorie and high fiber. It contains almost no fat and cholesterol and is rich in unsaturated fatty acids, which is unmatched by other foods. Dietary fiber can not only prevent the absorption of fat and cholesterol in the intestine, but also decompose cholesterol in the body, promote lipid metabolism, effectively prevent overnutrition and resist obesity, thus achieving the purpose of losing weight. Dietary fiber in sweet potato also has the special function of preventing sugar from being converted into fat. In addition, sweet potato contains a lot of starch, which can produce satiety after eating, thus reducing food intake and reducing weight. Sweet potato contains a substance similar to estrogen, which has a certain effect on protecting human skin and delaying aging. Eating sweet potatoes can inhibit the production of melanin. Sweet potato is also rich in potassium, which can reduce the disadvantages caused by excessive salt intake. Taking enough potassium can eliminate excess sodium. Eating sweet potatoes often helps to maintain normal folic acid levels in the human body. Eating sweet potato in daily diet can quickly neutralize the acidic substances produced by rice, flour, meat, eggs and other foods in human body, maintain the weak alkali balance of human blood, and at the same time convert carotene into vitamin A.

Eating too much sweet potato will lead to abdominal distension and exhaust, because sweet potato contains an oxidase, which will produce carbon dioxide in the intestine and then exhaust, so it is not advisable to eat too much sweet potato at a time. In addition, due to the high sugar content of sweet potatoes, heartburn is prone to occur on an empty stomach or eating too much, and gastric acid is secreted in large quantities. Hyperacidity will cause discomfort, stimulate gastric contraction, and may lead to acid water spitting in some acid-reflux feeding tubes. Therefore, in the process of eating sweet potatoes, you can mix some pickles, which can effectively inhibit gastric acid secretion. Sweet potato has a high sugar content. Eating on an empty stomach will produce a lot of stomach acid. When there is too much gastric acid, it will stimulate the gastric mucosa and cause gastric acid reflux, which makes people feel heartache. Sweet potato also contains an oxidase, which will produce a large amount of carbon dioxide gas in the gastrointestinal tract, which is easy to cause symptoms such as bloating and burping. Sweet potato contains a lot of sugar and can't be absorbed by human body for a period of time. The rest is easy to ferment in the intestine, making the abdomen uncomfortable. During the day, the best time to eat sweet potatoes is at noon, which is not only beneficial to digestion, but also beneficial to the body's absorption of calcium. It is advisable to eat sweet potatoes no more than three or two times a day.