There are many contraindications to the consumption of crab. In terms of cooking, it is necessary to steam and cook the crab before consumption, avoiding the selection of dead crab for cooking, and not to consume cooked crab that has been stored for too long. It is not recommended to eat it together with foods with high tannic acid content or other cold foods. There are some contraindications for people, such as people with a cold spleen and stomach, pregnant women, and people with high blood pressure, high blood lipids, gout and other diseases, so it is recommended not to eat or eat less.1. Cooking method: As raw crabs contain more bacteria, parasites and sludge, they need to be cleaned before consumption and cooked to a cooked state before consumption, and the amount of consumption needs to be controlled and it is not recommended to eat too much. It is important to avoid eating dead crabs. When the crab is dead, bacteria multiply and break down the amino acids in the crab meat and produce harmful substances, which may cause gastrointestinal discomfort, vomiting, diarrhea and even food poisoning in some people after consumption. In addition, the cooked crab try to eat up in time, if placed too long is also prone to bacterial growth, should also try to place in a low temperature, dry, ventilated, cool place; 2, diet with: crab meat is rich in protein, if eaten with foods with high tannic acid content, such as persimmons, hawthorn, grapes, pomegranate, black dates, etc., will react with protein combined into precipitation, easily cause indigestion, vomiting, abdominal distension, abdominal pain, diarrhea and other symptoms. The crab is a cold food, and eating it at the same time as other cold foods, such as watermelon and mangosteen, can easily affect the function of the stomach and intestines, causing symptoms of stomach pain and abdominal pain; 3. As crab is a cold food, it is not recommended to eat too much for a cold spleen and stomach and pregnant women. The crab is also rich in fat and cholesterol, so people with hypertension, hyperlipidemia, coronary heart disease, etc. should minimize or avoid eating it. In addition, because crab is a high purine food, it is not recommended for people with hyperuricemia and gout.