Eating less but bloating may be caused by dietary factors, or it may be caused by certain diseases, such as functional dyspepsia, chronic gastritis, cirrhosis of the liver, etc., and you should consult a doctor in time to find out the cause of the disease. 1. Dietary factors: If you eat foods that are easy to produce gas, such as beans, potatoes, radish, etc., which increase the production of gas in the intestines, and thus the symptom of eating less but bloating occurs, it can be recovered after improving the diet. 2. Pathologic factors: (1) Functional dyspepsia: it refers to the clinical syndrome of functional gastrointestinal disease without organic disease caused by gastric and duodenal dysfunction, with the main symptoms of postprandial fullness and early satiety, which may be accompanied by burning sensation in the middle and upper abdomen and lack of appetite. (2) Chronic gastritis: the most common cause of the disease is Helicobacter pylori infection, patients can mostly show fullness, discomfort in the middle and upper abdomen, burning pain, etc., but also lack of appetite, acidity, nausea and other dyspeptic symptoms. (3) Cirrhosis: Eating less but bloating may also be a symptom of decompensated cirrhosis, which is manifested as symptoms of maldigestion and malabsorption such as loss of appetite, nausea, abdominal distension, and aggravation after meals, and also emaciation, fatigue, and jaundice. In addition, such as intestinal obstruction, gastrointestinal tumors, peritonitis, chronic cholecystitis, chronic pancreatitis and other diseases can also appear to eat less, abdominal distension, but this symptom alone is not enough to diagnose the disease, should be promptly consult the doctor, improve the relevant examination, and targeted treatment.