The reason is that there is a white-line-like tendon in the skin of carp. This tendon is called "Sao tendon", which has a strong smell and belongs to hair. Because the sexual taste of grass carp has a fishy smell, it is difficult to be accepted by patients, which will lead to a decrease in appetite and is not conducive to digestion, so carp is hair, not grass carp.

Grass carp does not belong to hair. Grass carp belongs to Cyprinidae. Carp itself has a good effect on water circulation in the theory of traditional Chinese medicine. As early as in the classical medical books of traditional Chinese medicine, it was recorded that carp was used as medicine to eliminate edema. Moreover, grass carp contains a large amount of nutrients needed by protein and human beings, which still has a certain effect on nourishing patients with physical weakness.

According to the hair performance, it can be divided into seven categories:

One is hot things, such as onion, ginger, pepper, pepper, beef, mutton, dog meat and so on.

Second, things that cause wind, such as shrimp, crabs, geese, eggs, and buds.

The third is damp and hot things, such as caramel, glutinous rice, pork and so on.

Fourth, cold products, such as watermelons, pears, persimmons and other cold products.

The fifth is to mobilize blood things, such as sea pepper and pepper.

Sixth, things that stagnate qi, such as mutton, lotus seeds, gordon euryales and so on.

Seventh, folk long-term practical conclusive hair products, such as konjac, taro, kimchi, coriander, leek and so on.