Yam is good. Because Dioscorea opposita is a nutritious rhizome food, which is rich in dietary fiber, carbohydrates, vitamin C and minerals, it has positive effects on nerve, bone and blood health, and is suitable for cooking or stewing, showing a relatively moist taste; Although iron yam also has high nutritional value, iron yam tastes dry and is easy to cook when cooked, so hairy yam is good.