These three kinds of crabs can't be eaten because of the strong autumn wind.

The autumn wind blows gently, and the crab roe is plump, which is a good season for lake crab to go public and Jiangnan to eat crabs. Experts remind that although crabs are rich in nutrients and trace elements, they may get sick if they are not eaten properly. Crab is rich in protein and amino acids, and low in fat, so it is a good source of high-quality protein. At the same time, crabs are also rich in calcium and vitamin A. Although crabs are nutritious, there are three kinds of crabs that cannot be eaten. First, dead crabs can't be eaten. Even if it is just dead, it is best not to eat it. Crabs are omnivores, especially like to feed on decaying animal and plant carcasses, so they inevitably carry a lot of bacteria and viruses. Live crabs can compete with microorganisms and inhibit their reproduction because of their own metabolism. After the death of crabs, these microorganisms can use their rich nutrients to multiply rapidly, leading to the decay of crabs and the production of various toxins. People may have symptoms of food poisoning such as fever, vomiting, abdominal pain and diarrhea after eating. Besides, crab meat is rich in histidine. When crabs die, some bacteria containing histidine decarboxylase can decarboxylate swimming histidine in crab meat under appropriate conditions, forming a large amount of histamine. Histamine is a sensitizing substance, which can dilate venules and capillaries, promote secretion of mucosa and glands, lead to allergic symptoms, and even cause circulatory failure in severe cases. Second, drunken crabs can't be eaten. Experts believe that the crab-eating crabs used by drunken crabs generally live in streams, stone beaches and the bottom of lakes. Their living environment creates good conditions for the parasitism of paragonimiasis, but the alcohol contained in liquor is not enough to kill them. Once the drunken crab is eaten, Paragonimus enters the human body and grows into adults to lay eggs. In severe cases, it can parasitize other organs such as brain, skin and liver. 3. Don't patronize crabs processed with washed crab powder. Not long ago, it was found in the market that some unscrupulous businessmen lost their professional ethics because of the temptation of economic interests, and washed ordinary rice crabs into high-grade Yangcheng Lake hairy crabs with crab powder to make huge profits. Crab washing powder is an industrial oxalic acid solution, which has a strong corrosive effect and is generally used as a rust remover in industry. Eating crabs treated with it may cause mucosal damage in the digestive tract. At the same time, oxalic acid is also an antagonist of divalent ions such as magnesium, calcium and iron, which will not only hinder the absorption of these minerals by human body, but also form insoluble oxalate with them, which will be deposited in renal tubules, leading to crystallization of urinary system.