1, undercooked fish: Eating undercooked fish may lead to parasitic infection. When cooking fish at home, please make sure that the fish is easy to peel off and tender, and the meat should have no translucent signs. Don't put uncooked fish and other food plates together to avoid cross-contamination.

2. Overfrying: Frying fish may also increase the mercury content of fish. Over-frying fish, or matching it with high-fat and high-calorie sauces, will soon become an unhealthy diet. It is a very bad time to eat fish.

3. Fish with high mercury content: Most fish are slightly polluted by mercury, and most healthy adults have no problem in decomposing trace mercury. However, pregnant or breast-feeding women and children should avoid some fish and shellfish to reduce the harm of mercury poisoning.

Larger fish have the highest mercury content, such as sharks, swordfish, mackerel and square head fish. For most people, it is best to avoid eating these fish as much as possible. You can choose to replace them with other species of fish and shellfish with less mercury, such as shrimp, cod, canned tuna, salmon and catfish.

Extended data:

The following three groups of people should not eat more fish:

1, tuberculosis patients: When taking isoniazid, some fish are prone to allergic reactions, ranging from nausea, headache, skin flushing, conjunctival congestion, etc., to palpitations, swelling of the mouth, lips and face, rash, diarrhea, abdominal pain, dyspnea, elevated blood pressure, and even hypertensive crisis and cerebral hemorrhage.

2. Patients with liver cirrhosis: It is difficult for the body to produce coagulation factors during liver cirrhosis, and the platelets are low, which easily leads to bleeding. If you eat sardines, herring, tuna, etc. rich in eicosapentaenoic acid again, your condition will deteriorate sharply, just like adding insult to injury.

3. Those who take certain drugs: those who take cough medicine should not eat fish, especially deep-sea fish, so as not to cause histamine allergic reaction, which may lead to discomfort symptoms such as skin flushing, conjunctival congestion, dizziness, rapid heartbeat and urticaria. Many deep-sea fish contain histamine. Once the amount of histamine in the human body exceeds the standard, the substance will enter the human blood circulation, leading to histamine allergic reaction.

People's Daily Online-Fish Taboo Reveals People Who Should Not Eat Fish