Dead crabs should not be eaten.

Dead crabs produce large amounts of histamine in their bodies. People who consume dead crabs can develop histamine poisoning. Because histamine is an allergic poison, it can also be called allergic food poisoning. Don't feel that it doesn't matter if you eat just a little bit of dead crab meat. People who are allergic to histamine can have a reaction to even a bite.

For example, symptoms such as flushing of the cheeks, flushing of the skin and congestion of the conjunctiva on the chest as well as all over the body, as well as headache, dizziness, tightness in the chest, generalized fatigue and irritability, can occur within 10 minutes to three hours of eating dead crabs.

Extended Information

Dead crabs should never be eaten. Because dead crabs another important cause of poisoning is bacterial infection. Generally speaking, wild river crabs do not live in the same environment as artificial and marine crabs, so once they die, bacteria inside and outside their bodies will multiply, break down the crab meat, and produce toxins. Relatively speaking, the risk of bacterial infection is higher, and people are more likely to develop bacterial infection after consumption.

It should be noted that a 3-two to 4-two crabs can eat only 60 grams to 80 grams. Dietary guidelines for Chinese residents recommend 40 grams to 75 grams of aquatic products per person per day, so don't eat more than one crab per day.

Allergic people, patients with hyperuricemia or gout, pregnant women, the elderly, children, the frail, it is best to eat less or no crab. If you are pinched by a crab, you should immediately flush the wound with water and disinfect it with iodine vapors, and if the redness and swelling don't go away and the bleeding doesn't stop, you should rush to the hospital.

Reference? People's health network - why dead crabs can not be eaten