1, oysters viscera, shells and feces can not be eaten. Oysters are a kind of aquatic products, rich in nutrients, containing essential amino acids, taurine, a variety of vitamins and minerals, etc., but they can not be used blindly, because there are some places in the oyster that can not be eaten.
2, offal. The offal of oysters can not be eaten because it contains a lot of heavy metals, which is not good for the body.
3, shell. The shell of the oyster can not be eaten, it is difficult to chew, difficult to digest and absorb, eating will cause discomfort.
4, feces. Oyster excrement is not edible, because the oyster excrement is not only bad taste, and no nutritional value, sometimes there will be allergies as well as poisoning.