Chinese yam, also known as Dioscorea opposita, Dioscorea opposita, Dioscorea opposita, sweet potato and Dioscorea opposita, has been cultivated in China for more than 2, years. Yam has high nutritional value and is rich in many nutrients. Yam not only has the functions of invigorating spleen and stomach, helping digestion, nourishing kidney and essence, benefiting lung and relieving cough, but also has the functions of preventing cardiovascular disease, prolonging life, resisting hepatic coma, losing weight and bodybuilding, and has a good dietotherapy effect.

Dioscorea opposita is a nutritious food with the same origin as medicine and food. There are many varieties, such as iron stick yam, hemp yam, Ganoderma lucidum yam, small white-billed yam, fine-hairy yam, Dahe taro yam, Chinese yam, water yam, ox leg yam and so on. Different varieties of yam are distributed in different regions. Among them, Dahe Changyu yam is planted in Xuzhou, Jiangsu, Xiaobaizui yam is cultivated in Hebei, and Niutui yam is mainly distributed in Shandong.

"Yam" got its name because of the taboo of two emperors. According to Li Shizhen's Compendium of Materia Medica, during the Tang Daizong period, yam was taboo for the first time, and it was renamed as "Potato Medicine" because its ancestral name was Li Yu, and "Yu" and "Dioscorea opposita" were homonyms. In the period of Emperor Yingzong of Song Dynasty, the name of Emperor Yingzong was Zhao Shu, with the same pronunciation as "Shu" and "potato", and yam was taboo for the second time, so it was renamed "potato medicine" as "yam". It has been used ever since.

Chinese yam has a good health care effect, and it is a good folk tonic, but eating Chinese yam is also taboo, so why not eat Chinese yam with what? The foods that can't be eaten with yam are kansui, alkaline medicine, shrimp, pork liver ... medicine. It is a straight cone when it is dug in winter. It needs to be carefully dug to dig out a complete and slender strip of yam. After digging, the roots are removed, peeled, sliced while fresh, and dried. Plants that can survive the winter are not afraid of the cold. Eating them in the stomach is beneficial to the body. The herbs are sweet in taste and flat in nature, and enter spleen, lung and kidney meridians.

it can benefit qi and nourish yin, tonify spleen, lung and kidney, and stop leukorrhagia. Tonifying spleen, lung and kidney (is this an idiom? ), which means invigorating spleen, moistening lung and nourishing kidney yin. When the spleen and stomach are not good, yam is used with Poria cocos and Codonopsis pilosula. For chronic cough due to lung deficiency, yam is used together with Radix Pseudostellariae and Radix Adenophorae. Frequent urination at night, you can use Liuwei Dihuang Pill, which contains yam.