A Registered Dietitian Nutritionist (RDN) is not simply a nutritionist. If you work with an RDN, you know that they have been through regulated and extensive academic coursework in biochemistry, organic chemistry, medical nutrition therapy, food science, research, and eating behaviors. Not only have RDNs completed specialized coursework, they also must complete a year of internship rotations with an accredited program, including a clinical rotation in a hospital setting. To maintain their registration, they must complete a specific amount of continuing education, as regulated by the Commission of Dietetic Registration. Nutritionists and certified nutrition experts complete their certifications or degree programs outside of this regulated process.
Therefore, as the Commission of Dietetic Registration says, “all registered dietitians are nutritionists, but not all nutritionists are registered dietitians.”