After removal of the gallbladder, the body loses its functions of storage, concentration, bile excretion and secretion. The problem of fat digestion is that no concentrated bile enters the small intestine, the concentration of bile acids in the intestine decreases, and the content of bile salts is reduced by half compared to normal people. If the fat content of the ingested food is high, it will cause poor digestion of fat and affect the absorption of fat-soluble vitamins, after a period of time the body will gradually adapt and compensate, this process takes 2 to 3 months. Therefore, during this period of adaptation, the intake of fat should be limited, especially 1 time can not eat food containing too much animal fat. Generally, we use the method of eating less and more meals, and one meal should not be too full. Food content can be low-fat semi-liquid or low-fat soft meals, such as various kinds of porridge, noodles, bread, cookies, tofu, egg whites, fat-free milk, low-fat lean meat, less fiber vegetables and fruits, etc.. Cooking by stewing, steaming or boiling is appropriate. Fat control can be transitioned from 20 grams per day to 40 grams per day, depending on tolerance to food. After a period of adaptation after surgery, the intake of fatty foods will be gradually liberalized. Main causes of diarrhea after cholecystectomy Many patients with cholecystitis and cholelithiasis often have unformed, thin stools or even diarrhea within 3-6 months after cholecystectomy. The symptoms are more severe if they eat fatty foods. This condition is medically called “fatty diarrhea”. So, why do patients with cholecystitis and cholelithiasis have diarrhea after gallbladder surgery? This is because bile is secreted by the liver, which secretes about 800-1,000 ml of bile every day. Bile flows into the duodenum through the bile ducts to help digestion of fat and absorption of fat-soluble vitamins A, D, E and K. At the same time, the gallbladder also has the function of storing and storing bile. At the same time, the gallbladder also has the function of storing and concentrating bile. However, after the gallbladder is removed in patients with cholecystitis and cholelithiasis, the bile secreted by the liver flows directly into the common bile duct and enters the small intestine. When people eat, their digestive ability, especially the ability to digest fat, is significantly reduced because the intestine lacks a sufficient amount of highly concentrated bile to help digestion and absorption of fat. As a result, some of the poorly emulsified fatty food is excreted in the feces, at which point the patient develops diarrhea. In addition, after gallbladder removal, a large amount of bile produced by the liver enters the intestine directly without being stored and concentrated by the gallbladder, which is also an irritant to the empty, food-free intestine and can cause diarrhea or unformed stools. After gallbladder removal, the body gradually undergoes some compensatory changes to adapt to the needs of digestion. During this compensatory and adaptive time, the digestion and absorption of fat will be temporarily affected to some extent. After 3-6 months, according to the body’s reaction to fatty food, gradually increase some fatty food until the normal amount is maintained. If there is discomfort or diarrhea, then reduce some or temporarily do not eat fatty foods for a few days as appropriate. Some people interpret “less fatty food” as less animal fat and no restriction on vegetable oil. In fact, this will also produce the same symptoms. Because whether it is vegetable fats or animal fats, the digestion and absorption in the intestine must be involved in bile. Therefore, if too much vegetable oil is eaten at one time, the symptoms caused are the same.