Ma yam, commonly known as mountain yu, vegetable yam, white yam, alias yam yu, yam medicine, belongs to the family Dioscoreaceae, is an annual or perennial trailing plant ma yam chemical composition: root containing saponins, mucilage liquid, uracil choline, glycosides, amylose, protein (2.7%), fat (0.2%), starch (16%) and sulfuric acid and so on. Hemp yam is a nutritious food, but also has a certain medicinal value, it is warm, flat and sweet, with astringent and stop belt, diarrhea and dysentery function, as a nourishing and strong agent. Steamed and eaten on the baby, maternal and physical weakness of the elderly nourishing effect is particularly obvious. Sugar gourd dipped into yam beans with sesame yam has long been a favorite leisure food. Medicinal value Suitable for physical weakness, mental fatigue, loss of appetite, indigestion, chronic diarrhea, coughing, spermatorrhea, night sweats, diabetes and increased nocturia. Yam is rich in nutrients, containing protein, arginine, vitamins, sugars, minerals, mucus, starch and other substances, in which amylase breaks down starch, so complementary and not stagnant Shijiazhuang City Third Hospital supervising dietitian Zhai Geen introduced the nutritional value of hemp yam is very high. This is because it is rich in mucus, starch, amino acids and other ingredients, but also contains some vitamins as well as trace elements.　Therefore, eating some hemp yam every day is very good for the body. Especially, after it is steamed, it has a soft texture, which is good for chewing and absorbing, and it is more suitable for people with bad teeth like the elderly and children.　Not only clears the lungs, but also helps with digestion Hemp yam "Hemp yam can be used as a medicine, is a kind of tonic medicine, it enters the lungs, spleen and stomach meridian. Therefore, it has the effect of clearing the lungs, moisturizing the lungs and tonifying the spleen." Zhang Cheng Yun, deputy director of the Chinese medicine internal medicine department of the provincial hospital of traditional Chinese medicine difficult and miscellaneous diseases room, said.　Hemp yam can also be solid spleen, spleen and stomach is healthy to promote digestion and absorption. In addition, it also has the role of de-dampening and de-etching, for swollen patients, women postpartum, children's diarrhea also has a certain therapeutic effect.