Lack of appetite, usually clinically known as loss of appetite, can generally be improved by adjusting diet and lifestyle habits, but if it is caused by disease factors, it should be detected, diagnosed and treated as early as possible. If the loss of appetite is caused by factors such as poor daily rest and stress, and is not accompanied by other uncomfortable symptoms, it is recommended to regularize rest and diet, exercise appropriately, and ensure sufficient sleep; at the same time, adjusting mood and relaxing the mind, after mental tension is relieved, can effectively promote appetite. Diet can be appropriate to eat acidic food, stomach and digestion, such as hawthorn, plum, orange, etc.; eat more fresh vegetables, rich in vitamins and dietary fiber diet can promote gastrointestinal peristalsis, speed up digestion and absorption; eat more easily digestible food, reduce the burden on the stomach and intestines; eat less and more meals, avoid eating too much, and avoid intake of high-fat fried food. If long-term loss of appetite is accompanied by other symptoms such as diarrhea, vomiting, weight loss, depression, etc., it is necessary to seek medical attention to identify the cause and treat the symptoms. Diseases such as gastritis, gastric ulcer and peptic ulcer usually cause loss of appetite and can be treated with oral acid suppressants and mucosal protectors. For example, depression and anxiety disorders can be accompanied by loss of appetite and weight loss, and psychiatric consultation is recommended. In addition, it may also be caused by micronutrient deficiency, hypothyroidism, etc. Therefore, if you lose appetite for a long time, you need to seek medical attention and treatment.