Yam bean's skin is edible, but it must be washed. Yam bean itself is relatively small, so peeling is very inconvenient. Yam bean's skin is rich in trace elements, especially the trace element copper. Eating yam skin can supplement the copper needed by human body, which is very important for human body.

If you don't want to eat the skin, bite the cooked yam bean with your teeth, squeeze it slightly with your fingers, and peel it after cooking is very convenient. If you have bought yam bean for a long time and there are black spots on the yam bean skin, don't eat the skin of yam bean. Eating it is not good for the human body and is in danger of poisoning.

Extended data

Under normal circumstances, the Reiyoshi of Chinese yam grows after the 20th node of the stem and vine, and most of them begin to occur in the axils of the leaves at the top of the main stem or lateral branches of Chinese yam. Anatomically, Reiyoshi is called a plant bud. Periplaner division is often carried out by the cells in the 1-2 layer under the epidermis of the leaf axils, which increases the number of cell layers, and the bulge of the leaf axils can be seen in the fifth to sixth sections.

From the longitudinal section, the cells in the second and third layers under the epidermis continue to divide horizontally and vertically, forming a cluster of meristem buds. When the small green plant buds are seen on the outside, the terminal buds begin to differentiate inside, and the root primordium is formed at the same time. Due to the pericentric division of the cells in the meristem of the plant bud, the number and volume of the cells increase, and the plant bud becomes a spherical Reiyoshi.

References:

Baidu Encyclopedia-yam bean

Baidu Encyclopedia-Reiyoshi