The circulatory system, respiratory system and reproductive system of shrimp are all concentrated in the head and chest, and the abdomen can be said to be just a moving organ. There are not only many shaped eggs in the shrimp head, but also many other crayfish's own garbage toxins. The head of lobster absorbs heavy metals and toxins very easily. 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 thread on the peeled shrimp. The black line behind the belly of shrimp is its intestines, and of course it is also shrimp excrement, 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 an intermediate host. Take clonorchiasis as an example, its larva "metacercaria" is parasitic in the muscle of shrimp, and people who eat shrimp containing metacercaria may infect liver fluke disease. People always think that parasites in food can be killed during high-temperature cooking, but scientific research shows that some parasites cannot 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 crayfish with clear water for 24 hours after buying them, which is enough for lobsters to discharge their original stolen goods. At the same time, wash the dirty things on it with a brush to remove the hidden sediment and internal organs.

Before cooking, you can consider removing the shrimp head to ensure that the crayfish are cooked. Crayfish must be eaten in moderation, not everyone is suitable for crayfish. Some patients with gout and hypertension are not suitable for crayfish. Crayfish should not be eaten with grapes, pomegranate, hawthorn, persimmon and beer. Otherwise, it will cause vomiting, dizziness and diarrhea. It is not advisable to take vitamin C tablets after eating shrimp.