Of course, there is a scientific basis for not eating dead crabs: crabs live in water and like to eat dead fish, dead shrimp and other corrupt animal carcasses, and they will be infected with certain bacteria in crabs. Especially river crabs, most of them grow in dirty ponds, and a large number of germs are stained inside and outside the crabs. Live crabs can excrete bacteria through metabolism in the body; Once a crab dies, the bacteria in his body will multiply and decompose crab meat, and some bacteria also produce toxins. If people eat such crabs, they will cause food poisoning, and the common manifestations are nausea, vomiting, abdominal pain and diarrhea. In severe cases, dehydration, electrolyte disorder, convulsion, even shock, coma and septicemia may occur. If the above situation occurs, they should be sent to the hospital immediately, given glucose saline or compound sodium chloride intravenous drip, supplemented with liquid, and encouraged patients to drink more water and tea. Timely potassium supplementation to maintain electrolyte balance, sensitive antibiotics to control and prevent infection. Give antihypertensive drugs and other symptomatic treatment to those with low blood pressure. Therefore, when buying crabs, we must pay attention to whether they are fresh or not. Don't buy dead crabs, especially river crabs, and cook them thoroughly when using them, so as to kill the germs inside and outside the crabs.