catering nutritionist, mainly engaged in catering-related nutrition work, such as nutrition catering scheme, development of nutrition recipes, training of nutrition catering staff, and training of catering service personnel.

A food nutritionist, who mainly works in food enterprises, is mainly responsible for food-related nutrition such as food development.

public dietitians, also known as public dietitians, are related to the public, mainly engaged in the dissemination of nutrition knowledge, group nutrition surveys, planning of various nutrition-related social activities, and planning of films, movies and other works related to nutrition knowledge publicity and education. Its work content is mostly intangible products such as nutrition knowledge.