China's diet and Chinese medicine are two great contributions to mankind. What can concentrate medicine and food is diet, which can be said to be a magnificent flower in China and even the world. That is to say, under the guidance of TCM theory, nutrition is an applied preventive health care discipline, which studies the combination of medicine and diet for health care, disease prevention and longevity by using relevant knowledge such as nutrition, nutritional therapeutics, nutritional hygiene and cookery. It is not only a treasure in China's medical treasure house, but also a pearl in China's preventive therapeutics. It can be said that it is a leader in oriental nutrition. Dietitian is a popular profession in China in recent years to meet the needs of social development. Nutritionist is a compound and applied senior talent who integrates medicine, traditional Chinese medicine, exercise and health preservation, nutrition, food science and cookery. In order to popularize the traditional and reasonable diet regimen, carry forward the traditional and reasonable eating habits, carry forward the homologous culture of medicine and food in the motherland for thousands of years, and combine the advantages of modern nutrition to advocate natural dietotherapy to prevent diseases and delay aging; China Holistic Health Alliance's use of diet to prevent diseases is the science of health preservation and the new direction of medical development in 2 1 century. Diet is the foundation of treating diseases, and dieters who can use diet and medicated diet to keep healthy and treat diseases are the most knowledgeable.