What is the difference between a Nutritionist, an RD, and an RDN?

The term "nutritionist" is more ambiguous. It can refer to someone with extensive education, such as a Ph.D. in nutrition science, or to someone with minimal training, like a weekend workshop certificate. The key is to ensure whoever you work with has comprehensive training for your specific needs.

A Registered Dietitian (RD) is a qualified nutrition professional who has at least a Bachelor's degree in nutrition science, completed 1200 hours of supervised dietetic practice, and passed a national certification exam. Starting in 2024, RDs are required to earn a master's degree. To maintain their credentials, RDs are required to earn a minimum of 75 Continuing Professional Education (CPE) credits every five years. 

The terms RD and RDN mean the same thing. The RDN (Registered Dietitian Nutritionist) credential is a newer term endorsed by the Academy of Nutrition and Dietetics, primarily to leverage the more commonly recognized term "nutritionist." 

In the United States, only "Registered Dietitians" are qualified to work in clinical or medical settings, such as hospitals and long-term care facilities.