Nutritional caterer is mainly engaged in the preparation of recipes and nutritional meal production and cooking directly related to the work, do not need a very high level of vocational skills can be engaged in related work; public **** dietitian is mainly engaged in consulting, nutritional guidance, and nutritional knowledge and other nutritional consultant work, and the content of their work is mostly nutritional knowledge of the intangible products, belonging to the vocational skills of the talents. In many nutritionist in the most authoritative certificate of the highest gold to belong to the public **** nutritionist, because he is issued by the Ministry of Human Resources and Social Labor Security, the certificate is also the national common, lifelong effective, and other nutritionist certificate is generally issued by the Technician Association certificate, basically nothing gold is not recognized by the employment unit, so the public **** nutritionist is the highest gold certificate of all the nutritionist. The public **** nutritionist is the most valuable certificate of all nutritionists.