The profession of nutritionist combines the characteristics of chefs, health practitioners, medical practitioners, traditional Chinese medicine, psychologists, marketers, administrators and other professions. Nutritionists scientifically and rationally prepare the public's diet and promote people's health. improve the health of the people, reduce the occurrence of various chronic diseases, and comprehensively popularize nutritional knowledge to the whole society to improve the nutritional awareness of the whole people, so as to achieve the purpose of enhancing the physical quality of the whole people.

Based on different functions, nutritionists can be divided into clinical nutritionists, public nutritionists, food nutritionists, sports nutritionists, catering nutritionists, etc.