In the “medical forest compilation to explore the source” first recorded the medicinal value of sweet potato, said its raw use can “quench thirst, wake up the wine, benefit the lungs, nourish the heart” cooked food can “benefit the qi, fill the hunger with grain food”. The contemporary “Chinese Materia Medica” also summarized its taste and function, saying that it is “sweet in taste, flat in nature, belongs to the spleen, kidney meridian, nourishes the middle and benefits the qi, benefits the qi and generates fluids, broadens the intestines and stomach, passes constipation, treats spleen deficiency edema, defecation, sores and swelling poison, intestinal dryness and constipation”. Modern scientific research has confirmed that sweet potato contains protein, fat, dietary fiber, carotene, vitamin A, B, C, E and potassium, iron, copper, selenium, calcium and more than 10 kinds of trace elements, has a high nutritional value. Each 100 grams of fresh sweet potatoes contain only 0.2 grams of fat, producing 99 kcal of calories, respectively, 1/4 and 1/3 of rice, is a good low-fat, low-heat food. Sweet potatoes are two jobs in one, it can be a staple food can also be a vegetable, because it has a lot of sugar, the carbohydrates contained can also provide energy. Sweet potatoes are indeed very good food, the Japanese Cancer Research Institute has studied many foods to find the top ten anti-cancer foods, ranked first is cooked sweet potatoes, ranked second is raw sweet potatoes. Sweet potatoes contain a lot of vitamin A, can improve the body’s immunity, especially for the skin has a certain nourishing effect. So often eat sweet potatoes can also maintain the elasticity of the skin, slow down the aging process. Sweet potatoes are also rich in dietary fiber, can also relieve constipation. But there are several considerations when eating sweet potatoes: first, must be cooked to eat, because raw food is not easy to digest and absorb, if not steamed through to eat, easy to make people bloated, feel uncomfortable. Second, sweet potatoes can not eat too much, because it contains too much sugar, eat more will affect the absorption of other nutrients. Third, people who have stomach acid themselves should eat less sweet potatoes. Fourth, sweet potatoes are blackened, there is mold can not eat, because that is toxic. Sweet potatoes or alkaline food. What is acidic food, alkaline food? Acidic food and alkaline food is not the food itself eat acid, it is acidic, you eat it feel not acid, it is alkaline. Rather, it depends on whether the final product is acidic or alkaline after we eat the food, after digestion and absorption and metabolism; in life, we eat more things that are acidic. What kind of food is acidic? Meat, eggs, and various staples; noodles, rice. We eat a lot of acidic food every day with big fish and meat, mountains and seafood, and our resistance is easily reduced and we get various diseases. So what to do? We all know acid-base neutralization, that is, the human body should be balanced. Yin and Yang are balanced, and acid-base should also be balanced. We eat meat, eggs, rice, noodles, these acidic food at the same time, but also eat more alkaline food, alkaline food, including sweet potatoes. Therefore, eat more sweet potatoes can enhance the human body, very beneficial to prevent disease.