Loss of appetite is the result of reduced digestive system function, which can cause nutritional deficiency symptoms and induce diseases, commonly due to the following factors: 1, weather and environmental factors, such as weather too cold, too hot, stuffy environment, etc. 2, dietary factors, overeating, smoking and drinking, cold, stimulating food, etc. 3, long-term use of drugs, drugs on the gastrointestinal tract stimulation to increase the toxins in the body, inducing disease. 4, excessive emotional Tension, mental, life, work stress, etc. can also cause the body’s metabolic capacity to decline, weakening the gastrointestinal function. 5, the body lack of elements caused by, for example, people lack of vitamin B6 affect the absorption of nutrients, decomposition, which in turn causes loss of appetite. 6, the digestive system itself diseases, such as gastritis, esophagitis, gastroduodenal ulcer, gastrointestinal tumors, etc., need gastroscopy to clarify. 7, the Other system diseases, such as liver and kidney failure, heart and lung diseases, etc., need to actively search for the cause.