How to become a Registered Dietitian Nutritionist (RDN)
Registered Dietitian Nutritionists (RDNs) translate nutrition science into patient-care plans across clinical, community, sports, food-service, and outpatient settings. About 75,000 RDNs practice nationally per the Commission on Dietetic Registration; the credentialing requirements moved from bachelor's to master's as of January 2024.
Education
As of January 2024, the Commission on Dietetic Registration (CDR) requires a graduate degree to sit for the RDN exam — typically a Master of Science in Nutrition or a coordinated program leading to MS + supervised practice. ACEND-accredited programs are the only ones whose graduates are eligible.
Supervised practice
Candidates complete an ACEND-accredited supervised-practice rotation (formerly a "dietetic internship") totaling at least 1,000 hours across clinical, community, and food-service settings. Coordinated programs integrate the supervised practice into the master's curriculum; standalone internships run ~9-12 months post-degree. Match rates for standalone internships historically run 50-70% — coordinated programs avoid this risk.
Examination + licensure
After supervised practice, candidates sit for the CDR registration exam. Passing = RDN credential. About 38 states + DC also require state licensure in addition to RDN — application requirements vary; some states accept CDR registration directly, others require a state-specific application + fee.
Practice settings
Clinical (hospital + outpatient) is the largest segment — inpatient medical nutrition therapy, diabetes education, weight-management programs, oncology nutrition, renal/dialysis, eating-disorder treatment. Other paths: community + public health (WIC, SNAP-Ed), sports nutrition (collegiate, pro teams), corporate wellness, food-service management (Sodexo, Aramark, Compass), retail (supermarket dietitians at Kroger / Wegmans), private practice (insurance-billed or cash-pay), and pharmaceutical / food industry.
Specialization
CDR offers board certifications in 8 specialty areas — oncology (CSO), pediatric (CSP), renal (CSR), gerontological (CSG), sports (CSSD), obesity/weight management (CSOWM), and Intuitive Eating + clinical eating-disorder credentials offered through other bodies.