Sweet potato, also known as yams, groundnuts, rich in sugar, vitamins, minerals, dietary fiber. Carotene, vitamin B1 and other vitamins in sweet potatoes are necessary to maintain human health. At present, the World Health Organization (WHO) after three years of research and selection, selected the top six health food. The selected healthy foods include the best vegetables, the best fruits, the best meat, the best cooking oil, the best soup, the best brain food six categories. People are familiar with the sweet potato, was listed as 13 kinds of best vegetables champion. Experts say that sweet potato is not only nutritionally balanced, but also has a little-known role in preventing sub-health, weight loss, bodybuilding and anti-cancer. Sweet potato is rich in starch, vitamins, fiber and other essential nutrients, but also rich in magnesium, phosphorus, calcium, selenium and other mineral elements and linoleic acid. These substances can maintain the elasticity of blood vessels, and is also an ideal food for weight loss. Scientific data show that it is only 1/3 of the calories of rice, and because it is rich in fiber and pectin and has the special function of preventing sugar from being converted into fat. At this stage, food fiber is becoming more and more important for modern people. Medical research has confirmed that the lack of food fiber with laxative effect, can induce a variety of lifestyle diseases and colorectal cancer, so as a food fiber rich sweet potato, get more and more people love and sought after.　Sweet potato starch in sweet potato contains a variety of human needs of nutrients. Every 500 grams of sweet potato can produce about 635 kilocalories of calories, containing protein (protein food) 11.5 grams, sugar 14.5 grams, 1 gram of fat, phosphorus 100 milligrams, 90 milligrams of calcium, iron (iron food) 2 grams of carotene 0.5 milligrams, and also contains Vitamin B1, B2, C and niacin, linoleic (oil food) acid. Vitamin B1, B2 content than rice were 6 times higher and 3 times. Especially sweet potato is rich in lysine, and rice, flour precisely lack of lysine. But many hair people have not realized.　According to scientific research, eating sweet potatoes will not make people fat, on the contrary, sweet potatoes are an ideal weight loss (weight loss food) food. It contains very low calorie, much lower than the average rice, so do not worry about getting fat after eating, but can play a role in weight loss. Sweet potato also contains a substance similar to estrogen, to protect human skin, delay aging has a certain role.　Therefore, many foreign women (female food) to sweet potato as beauty (beauty food) food. Sweet potato raw food crisp and sweet, instead of fruit (fruit food); cooked food sweet and soft, eat in the mouth, sweet in the heart. It can be used as a staple food, but also as a vegetable (vegetable food). Steaming, boiling, frying, deep-frying, eating many ways, a skillful cooking, can also become a delicacy on the table.