Huai yam is sweet and flat in nature and belongs to the spleen, lung and kidney meridians. Its efficacy and effects are as follows: 1, yam contains amylase, which can be broken down into important substances that sustain human life, such as proteins and sugars, but also to lose weight and lighten the body, to avoid excessive obesity; 2, Huai yam for the spleen, lungs, kidneys, benefitting the qi and nourishing the yin effect is better, as the saying goes, white yam is better than ginseng, which contains too many nutritional elements, with lowering blood sugar, blood lipids, enhance immunity, anti-aging effect 3, one of the important components of yam is dopamine, has the function of dilating blood vessels, improve blood circulation, the composition in the rescue of circulatory failure occupies a very important position, while yam is rich in a large number of mucus protein, vitamins and trace elements, with the prevention of cardiovascular and cerebrovascular diseases, cholesterol and other therapeutic effects; 4, yam has a spleen, stomach, digestion, and is rich in amylase, polyphenol oxidase and other substances. For the spleen and stomach weakness, poor digestion and absorption, abdominal distension, tiredness and weakness after illness are very good food, has a relatively good health effects; 5, yam kidney essence, for deficiency of heat and thirst, spermatorrhea, slippery sperm, spermatorrhea is not solid diabetic patients, or kidney yin deficiency has a certain effect, but also educational and tranquilizing, prolong life; 6, the side effects of yam and contraindications: dry stool is not suitable for The side effects and contraindications of yam: it is not suitable for people with dry stools, and it is contraindicated for people with real evil.