Yam is a traditional tonic with rich nutrition, which can be eaten by ordinary people. As a health food, it is suitable for all ages. However, some people can't eat yam because its medicinal function will aggravate their illness. For example, yam has the function of helping dampness, and it is not suitable for people with heavy moisture in the body, nor for people with colds and bad stomachs. Eating too much yam is not good for women, so women should eat yam in moderation, because yam may cause menstrual disorder or dysmenorrhea.

Yam can also help the function of human body. Yam has the functions of invigorating spleen and stomach, tonifying lung and kidney, stopping diarrhea and promoting diuresis. It has good medicinal value for nephritis, diabetes, arteriosclerosis and tumor. Eating more yam is also helpful for the recovery of patients with chronic diseases. Yam can also be used to treat diabetes and fatigue cough, which has high medicinal value.

Regular consumption of yam can improve human immunity. People who are prone to sweating and catching a cold can eat more fresh yam to enhance their immunity. Yam can also be used to treat children's diarrhea. Yam powder is very effective for children's diarrhea, and it also avoids the side effects of children taking drugs. Yam not only has medicinal value, but also can be used to lose weight. It is a food with low fat and high fiber, which can enhance satiety. Eating yam can also reduce the fat deposition of cardiovascular system, which is a good staple food for dieters.

Yam can not be eaten with alkaline food, otherwise food poisoning symptoms may occur. Yam can't be eaten raw, and when we handle yam, we should be careful not to let the wound come into contact with the mucus on yam, and after handling the epidermis of yam, we should wash our hands several times to avoid itchy skin. Good yam has more mucus, less water and white fault. Chinese yam skin is also ok. Chinese yam can be used for cooking and porridge after peeling.