Crab contains more histidine, which is easy to decompose and can produce histamine and histamine-like substances under the action of decarboxylase. Especially when the crab dies, histidine decomposes more rapidly. The longer the crab dies, the more histamine is accumulated in the body. When the histamine is accumulated to a certain amount, it will cause poisoning if eaten.
Among all the toxins, there is a very important part-ammonia. Crabs can carry ammonia, which needs to start with its rich protein. Crab contains a lot of protein. After it dies, the protein in the body will decompose into ammonia. After the dead crab is eaten into the human body, the excessive ammonia gas must be discharged through the human body, which will cause harm to health.
Extended data:
Taboos for eating crabs:
1, not suitable for eating raw crabs.
Crabs generally feed on animal carcasses or humus, so the body surface, gills and gastrointestinal tract of crabs are covered with all kinds of bacteria and sludge. Crabs often carry cysts of paragonimiasis and Vibrio parahaemolyticus. If not disinfected at high temperature, paragonimiasis can cause lung damage after entering human body.
If Vibrio parahaemolyticus invades the human body in large quantities, infectious poisoning will occur, showing symptoms such as intestinal inflammation, edema and congestion. Therefore, crabs should be steamed and cooked thoroughly, and generally heated for more than 30 minutes after boiling to play a disinfection role.
2, should not eat too much.
Even if you are greedy, you should endure it: because crab meat is cold, you should not eat more. People with spleen and stomach deficiency and cold should pay special attention to avoid abdominal pain and diarrhea. For abdominal pain and diarrhea caused by eating crabs, 0/5g of Perilla frutescens/KLOC-can be used, with 5~6 slices of ginger, and decocted with water.
References:
People's Daily Online-What you need to know about health: Can crabs be eaten when they are dead?
References:
People's Network-You can't eat persimmons after eating crabs. Pay attention to 5 taboos.