A Registered Dietitian Nutritionist or RDN (the spelling “ Dietitian ” is preferred over “ Dietician ” in the dietetics world, and the term Registered Dietitian has been updated to Registered Dietitian Nutritionist) is a nutritionist accredited by the Academy of Nutrition and Dietetics (formerly the American Dietetic Association or ADA). A Registered Dietitian Nutritionist has completed an undergraduate program in nutrition and also a one year clinical internship program. Registered Dietitian Nutritionists must pass a national exam administered by the American Dietetic Association. Registered Dietitians must also maintain their registered status through continuing education and advanced degrees/certifications for areas of specialization. Examples of this might be a certification as a cardiac dietitian, nutritional support dietitian, sports nutritionist, or a certification for diabetes education.