What is a Dietitian? Dietitians are food and nutrition experts that have at least a Bachelor’s degree in nutrition (most have Master’s degrees), have completed at least 1200 hours of supervised practice, have passed a national registration exam, and maintain their expertise through ongoing continuing education. Dietitians have the credentials “RD” or “RDN”; some may also have “CD” or “LD” (certified/licensed dietitian), and some specialize in diabetes education (“CDE”—Certified Diabetes Educator). Some people may call themselves “nutritionist” without these credentials, however Registered