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 think 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 one bite. For example, symptoms such as flushed cheeks, flushed skin and conjunctival congestion on the chest as well as the whole body, as well as headache, dizziness, tightness in the chest, generalized weakness and irritability can appear within 10 minutes to three hours of eating dead crabs.

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, the bacteria inside and outside their bodies will multiply, decompose 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.

Expanded:

Crab can not eat the place:

1, crab stomach: hiding in the crab yolk in the "triangular bag" Crab stomach where? Open the crab shell, see the shell stained with some crab yolk, crab stomach is hidden in the shell of the crab yolk. The crab stomach is dirty and not recommended for consumption.

2, crab gills: two rows of "small fan" After opening the crab shell, two rows of gray fan-shaped soft tissue on the crab body is the crab gills. Crab gills are the respiratory system of crabs and should not be eaten.

3, crab heart: black membrane under the "hexagonal plate"? Chinese medicine often say that the crab is extremely cold, and the crab heart is the most. Crab heart is a white hexagonal, it is generally located in the center of the crab under a black membrane coat.

4, crab intestines: crab stomach through to the crab umbilicus a black line crab intestines are located in the lower abdomen of the crab that can be broken open triangle. When you open the triangle, you can see a black line connecting the top of it to the crab's body.

People's Daily Online - Why you can't eat dead crabs

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