Yam is a precious Chinese herbal medicine with high medicinal value. Yam contains unique pharmacological components such as sapogenin and lutein, which is the main raw material for synthesizing steroid hormones. Its water-soluble extract can also be used to prepare new drugs for treating coronary heart disease. Chinese medicine believes that yam is flat and sweet, and has the effects of invigorating spleen and lung, consolidating kidney and replenishing essence, resolving phlegm and relieving cough. Can be used for treating diarrhea due to spleen deficiency, cough and gargle due to lung deficiency, chronic dysentery, diabetes, leucorrhea and frequent urination. Yam is often used as tonic and tonic, and it is the main component of dozens of Chinese patent medicines. Moreover, the high cellulose contained in yam can promote gastrointestinal peristalsis and reduce the occurrence of intestinal cancer, so it has high medicinal value. It can be fried, boiled, distilled with sugar, dried in the sun and used as medicine. It is a tonic, and has auxiliary effects on human weakness, chronic enteritis and diabetes.
Nutritional value Yam is rich in various nutritional and nourishing ingredients and is a popular high-grade health food. According to the determination of relevant departments, every 100g of dried yam contains crude protein 14.4%, crude fat 3.78% and starch 43.79% on average. It contains total sugar 1. 14% and ash 5.51%; It contains 2.62% potassium, 0.72% P2O5, 0. 14% magnesium, 0. 12% calcium, 53.57PPm iron, 29.22PPm zinc, 10.85ppm copper and 5.38PPm manganese. Every 100g of fresh yam contains 0.02mg of carotene, 0.08mg of vitamin B100, 0.02mg of vitamin B2, 0.4mg of vitamin C and 0.3mg of nicotinic acid, and its iron content is 3-4 times that of ginseng. In addition, yam also contains 16 kinds of amino acids, mucus juice, choline, polyphenol oxidase, mannan, phytic acid, arginine, allantoin and 3,4-dihydroxyphenylethylamine, which is one of the important tonics of 18 in China.