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Detailed introduction:
Yam is the dried tuber of Dioscorea, a perennial creeping herbaceous plant of the Dioscoreaceae family.
Cultivators call it domestic yam, and wild people call it wild yam; Chinese medicinal materials are called Huaishan, Huaiyam, Huaiyam, etc.
Because of its rich nutrition, it has been regarded as a high-quality and low-priced tonic since ancient times. It can be used as both a staple food and a vegetable.Can also be made into snacks such as candied haws.
China is mainly produced in Boai, Qinyang, Wuzhi, Wenxian and other places in Henan Province. It is also cultivated in Hebei, Shanxi, Shandong, central and southwestern regions and other regions. In winter, excavate after the stems and leaves have withered, cut off the roots, wash and dry.
There are two main types of yams cultivated in China: ordinary yam and field potato. Ordinary yam tubers are smaller, among which the "foot potato" from Sichuan and other places, the Huaiyam from Huai County, Shanxi, and the Nancheng Huaiyam from Jianghan are the most famous. Food review:

Yam has low calories and is recommended as a whole grain instead of staple food during weight loss.

Nutritional value:

1. Strengthens the spleen and stomach and aids digestion:
Yams contain amylase, polyphenol oxidase and other substances, which are beneficial to the digestion and absorption functions of the spleen and stomach. It is a medicinal and food product that can only tonify the spleen and stomach. It can be eaten regardless of spleen yang deficiency or stomach yin deficiency. Clinically, it is commonly used to treat diseases such as weakness of the spleen and stomach, lack of food, physical fatigue, diarrhea, etc.;

1. Nourishing the kidneys and replenishing essence:
   Yams contain a variety of nutrients, which can strengthen the body, nourish the kidneys and replenish essence. It can be taken by anyone suffering from kidney deficiency, spermatorrhea, excessive leucorrhea, and frequent urination in women;
   
2. Benefit the lungs and relieve cough:
   Yams contain saponins and mucus, which have lubricating and moisturizing effects. Therefore, they can benefit lung qi, nourish lung yin, and treat chronic cough caused by lung deficiency, phlegm, and cough;
   
3. Lower blood sugar:
   Yams contain mucus protein, which can lower blood sugar and can be used to treat diabetes. It is a good food therapy for diabetics;
   
4. Prolong life:
   Yams contain a large amount of mucus protein, vitamins and trace elements, which can effectively prevent the precipitation of blood lipids on blood vessel walls, prevent cardiovascular diseases, and achieve the effects of strengthening the mind, calming the nerves, and prolonging life;
   
5. Anti-hepatic coma
   In recent years, studies have found that yam has a sedative effect and can prevent hepatic coma. Nutrition Encyclopedia: