Crab meat is tender, delicious and nutritious. The content of protein is several times higher than that of pork and fish, and the contents of riboflavin, calcium, phosphorus, iron and vitamin A are also high. However, delicious crabs are not suitable for everyone. Because crabs are cold and contain a lot of protein and high cholesterol, people with certain diseases should fast or eat less. 1, patients with hepatitis should not eat crabs. Due to the edema of gastric mucosa, abnormal bile secretion and decreased digestive function in patients with hepatitis, crab meat is rich in protein, which is difficult to digest and absorb, resulting in food easy to stay and rot in the intestine, which often causes indigestion, abdominal distension, nausea and vomiting, and even a large number of hepatocyte necrosis, which aggravates the condition. 2, cardiovascular patients avoid eating crabs. Crabs contain high cholesterol (235 mg in100g crab meat and 460 mg in100g crab roe). Patients with coronary heart disease, arteriosclerosis, hypertension and hyperlipidemia eat foods with high cholesterol, which will lead to high cholesterol and aggravate the development of cardiovascular diseases, so eat less or not eat crabs (especially crab roe). People who have a cold and fever should not eat crabs. Cold diet should be light, high-protein crabs are not easy to digest and absorb, and it is easy to make a cold difficult to heal or aggravate the condition after eating. Anyone with spleen and stomach deficiency and cold should not eat crabs or eat less. Crabs are cold and easy to cause abdominal pain, diarrhea or indigestion after eating. In addition, patients with chronic gastritis and gastric and duodenal ulcer had better not eat crabs, because eating them is easy to make the old disease relapse or aggravate. If abdominal pain and diarrhea are caused by eating crabs, five slices of perilla 15g and ginger can be decocted to relieve pain and diarrhea. People with allergies should avoid eating crabs. After such people eat crabs, specific crab proteins enter the body through the intestinal wall with increased permeability, resulting in allergic reactions and a large amount of histamine, causing gastrointestinal smooth muscle spasm and vascular edema, nausea, vomiting, abdominal pain and diarrhea; Some can also cause measles or asthma. In addition, people suffering from dermatitis, eczema, tinea, sores and other skin diseases should also be careful to eat, because eating crabs will aggravate the condition. 6. People with biliary diseases such as cholecystitis and gallstones should not eat crabs. The formation of cholecystitis and gallstones has a certain relationship with excessive cholesterol and metabolic disorder in the body. Eating crabs is easy to make the disease relapse or aggravate. 7. Pregnant women should eat less or not eat crabs, because crabs have the function of dispersing blood, and pregnant women are prone to abortion and other consequences after eating. Chinese medicine believes that some aquatic products have the function of promoting blood circulation and softening hardness, which will cause early pregnancy bleeding and abortion after eating. Such as crabs, although delicious, but their cold nature, have the power of promoting blood circulation and removing blood stasis, so it is not good for pregnant women. Another example is turtle, which has the function of nourishing yin and tonifying kidney. For ordinary people, it is a nutritious dish. However, the turtle is salty and cold, which has a strong effect of promoting blood circulation and removing blood stasis, so it has some disadvantages of abortion. 8, the elderly should not eat more crabs. Because the digestive organs of the elderly are "aging", their functions are declining, and their digestion and absorption ability is poor, eating crabs should be based on tasting and should not be excessive. When eating, you can dip it in Jiang Mo vinegar juice to drive away the cold. In addition, children's digestive organs are underdeveloped and their digestion and absorption ability is poor, so it is not appropriate to eat more crabs.