The medicinal value of yam is 1. Can strengthen the spleen and stomach, help digestion: Yam contains amylase, polyphenol oxidase and other substances, which is beneficial to the digestion and absorption function of the spleen and stomach, and is a dual-purpose product for medicine and food. Both spleen yang deficiency and stomach yin deficiency can be eaten. Clinically, it is often used to treat spleen and stomach weakness, anorexia, fatigue, diarrhea and other diseases; 2. Tonifying kidney and replenishing essence: Yam contains a variety of nutrients, which has the functions of strengthening the body, tonifying kidney and replenishing essence. Generally, it is kidney deficiency, nocturnal emission, frequent urination and other symptoms. Can be taken; 3. Benefiting lung and relieving cough: Yam contains saponin and mucus, which has the function of lubricating and moistening dryness, so it can benefit lung qi, nourish lung yin and treat lung deficiency, excessive phlegm and chronic cough; 4. Lowering blood sugar: Yam contains mucin, which has the function of lowering blood sugar, can be used to treat diabetes, and is a good diet for diabetics; Remember to peel and eat.