Prerequisites to sit for the Commission on Dietetic Registration examination include a bachelor's degree, completion of the Didactic Program in Dietetics and completion of an approved practice program.
A person may call herself a nutritionist, advertise herself as a nutritionist or promote herself as a nutritionist without meeting academic or professional requirements in order to do so.
The Simmons School of Health Sciences website states that the term nutritionist is a generic one. However, even its Master of Science in nutrition graduates must complete the additional requirements of the Commission on Dietetic Registration to be considered registered dietitians.