The term “fire”, Chinese and Western medicine are not clearly defined, moderate consumption of yam will not bring any toxic effects to the human body. Yam is rich in nutrients, each 100g of yam contains 327kcal of energy, 70.8g of carbohydrates, 9.4g of protein, 1g of fat; crude fiber 1.4g. and contains calcium, potassium, magnesium and other minerals and vitamin A, vitamin C, vitamin B4 and other vitamins. Yam is a kind of potato 150g fresh yam is equivalent to about 25g raw grain. Moderate consumption of yam can provide the body with a certain amount of energy and a variety of nutrients. Yam is rich in carbohydrates and can be used as a substitute for some staple foods. There is no concept of fire in the consumption of yam, but attention should be paid to moderate consumption, daily dietary attention to food diversity, balanced diet.