It is not normal that the skin of yam is a little green. It is green because yam is moldy, with bacteria on its surface and a large number of green molds.

The biggest feature of yam is that it contains a lot of mucin, which is a mixture of polysaccharide and protein. It has special health care function for human body, and can prevent fat from depositing in cardiovascular system, maintain vascular elasticity and prevent atherosclerosis from happening prematurely.

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