The circulatory system, respiratory system and reproductive system of shrimp are concentrated in the head and chest, and the abdomen can be said to be just a motor organ. There are not only many formed eggs in the head of shrimp, but also many other crayfish's own garbage toxins. The head of lobster is very easy to absorb heavy metals and toxins. For these reasons, eating the head of crayfish may cause allergies and acute gastroenteritis, and the head and neck of lobster may cause paragonimiasis.

Except for the yellow shrimp in the head, you can't eat a line on the peeled shrimp's body. The black line on the back of the shrimp's abdomen is its intestines, and of course it is shrimp poop, which should be removed before cooking. In addition to these, you can't eat drunken shrimp, shrimp sashimi and other foods. Some parasites can use shrimp as the intermediate host. Take liver fluke as an example, its larvae "metacercariae" are parasitic in the muscles of shrimp, and people may be infected with liver fluke disease if they eat shrimp containing metacercariae. People always think that parasites in food can be killed during high-temperature cooking, but scientific research shows that some parasites can't be killed during cooking.

Extended data:

It is very important for the health of crayfish. If you eat crayfish outside, you should choose a restaurant with better sanitary conditions. If you cook crayfish yourself, you should spend more time cleaning crayfish. Moreover, it is best to bathe the crayfish and raise them with clear water for 24 hours after they are bought, which is enough for the lobster to discharge the original stolen goods from the body. At the same time, it is necessary to wash the dirt on its body with a brush and remove the hidden sediment and gut.

You can consider removing the shrimp head before cooking, and make sure that the crayfish is cooked. We must be temperate in eating crayfish, and not everyone is suitable for eating crayfish. Some patients with gout and hypertension are not suitable for eating crayfish. Crayfish should not be eaten with grapes, pomegranates, hawthorn, persimmons, beer, etc., otherwise it will cause vomiting, dizziness and diarrhea, and vitamin C tablets should not be taken after eating shrimp.