A nutritionist is a nutrition professional who can guide people in the fields of diet, disease prevention, adjuvant therapy, sub-health prevention and health management. Through strict basic nutrition theory study and professional clinical nutrition skills training, and can design good planning and follow-up services. In the legislation of dietitian law, the qualification certificate is regarded as qualified.

Clinical nutritionists are mainly engaged in disease-related nutritional diagnosis and treatment in hospitals, risk screening for outpatients and inpatients, nutritional status assessment and nutritional diagnosis, and making individualized dietary, enteral and parenteral nutritional treatment plans according to patients' conditions.