What is a Registered Dietitian?
Anyone can call themselves a "nutritionist" even without formal qualifications or experience. Someone who only calls themselves a nutritionist may be practicing without any formal education or any governing body to hold them accountable.
Registered Dietitian Nutritionists (RD/RDN) are nutrition experts and health care providers who have met (at minimum) the following criteria:
Completed at least a bachelor’s degree at an accredited university
Completed an 8-12 month accredited supervised practice program.
Passed a national exam administered by the Commission on Dietetic Registration (CDR) and maintained active registration status
Regularly complete ethical and professional continuing educational requirements to maintain certification