From the perspective of Western medicine, there is no clinical three people resolutely can not eat yam, usually healthy people can eat yam in moderation, but allergy should be avoided; from the perspective of traditional Chinese medicine, dampness in the fullness (dampness is too heavy to cause fullness of the spleen and stomach discomfort) or solid evil, stagnation of the person should be careful to eat. As a vegetable, yam contains 84.8g of water, 1.9g of protein, 12.4g of carbohydrates and other nutrients. Usually, healthy people can eat yam in moderation, which can replenish the nutrients needed by the body and provide energy. However, those who are allergic to yam are prohibited from eating it. As a kind of traditional Chinese medicine, yam has the effect of benefiting qi and nourishing yin (tonifying qi and yin), tonifying the spleen, lungs and kidneys, etc. It is suitable for spleen deficiency with little food, lung deficiency with wheezing and coughing. Therefore, people with dampness and fullness in the middle of the body or with solid evil or stagnation should consume it with caution to prevent aggravation of the condition, which is not conducive to the recovery of the body. It is recommended that people with no special contraindications consume fresh, washed and cooked yam in moderation, and avoid consuming spoiled yam or raw yam.