There is no such thing as “yam can not eat with which 10 kinds of food”, yam can be combined with a variety of foods, but also complementary nutrition. Yam contains starch, protein, a variety of minerals and vitamins and other nutrients. Every 100 grams of yam contains 12.4 grams of carbohydrates, 1.9 grams of protein, 0.2 grams of fat, vitamin C5 mg, 16 mg of calcium. Yam contains relatively high levels of yam polysaccharides, which are beneficial to human health. Yam generally has a high starch content, most of which is branched-chain starch, accounting for 70% to 80%. Branched-chain starch expands easily when exposed to water and is not easily digested. Therefore, it is not recommended that the elderly and those with weak digestive ability eat too much yam to avoid gastrointestinal discomfort such as indigestion.