2. The protein and fat content of fresh yam is not high, especially the fat content is very low. The carbohydrate content is 12.4g/ 100g, and it also contains many vitamins (including vitamin E) and rich trace elements necessary for human body. Fresh yam is used as the raw material of daily dishes.
3. The content of resistant starch in yam starch is high, and it has strong acid hydrolysis resistance and enzymolysis resistance, which can hinder the hydrolysis of ordinary starch and delay its hydrolysis speed in digestive tract, thus slowing down the postprandial blood sugar effect. Resistant starch can reduce the serum cholesterol content, increase the contents and excreta of large intestine, improve the intestinal microbial flora and increase the content of short-chain fatty acids in large intestine, so it is considered that starch is one of the effective components of yam.