What is the difference between a nutritionist and a registered dietitian?

There is a great deal of confusion surrounding the titles nutritionist and registered dietitian, and they are often used interchangeably despite being very different professions. In many regions, the title nutritionist is unregulated, meaning that anyone can use it regardless of their level of education or training in nutrition. As a result, a nutritionist’s credentials, knowledge, and scope of practice can vary widely.

In contrast, registered dietitian (RD or RDN) is a regulated and protected title. Becoming a registered dietitian requires extensive formal education and training, including a bachelor’s degree and a master’s degree in nutrition or a related field, completion of an accredited dietetic internship, and successful completion of the Registration Examination for Dietitians. Registered dietitians are also required to maintain their credentials through ongoing continuing education.

Registered dietitians work in a wide range of settings, including hospitals, nursing homes, community health programs, schools, research, and private practice. Importantly, they are qualified to provide medical nutrition therapy, which involves using evidence-based nutrition interventions to prevent, manage, and treat chronic conditions such as diabetes, heart disease, gastrointestinal disorders, and kidney disease. This clinical role is what clearly distinguishes registered dietitians from unregulated nutrition titles.