A registered dietitian (RD) is a health professional with specialized training in nutrition and diet who is credentialed to provide medical nutrition therapy. Unlike the loosely regulated title of “nutritionist,” the RD credential requires a graduate degree, at least 1,000 hours of supervised practice, a national exam, and ongoing continuing education. Registered dietitians work in hospitals, private practice, government agencies, and other settings, earning a median salary of $73,850 per year.
What Registered Dietitians Actually Do
Registered dietitians help people use food and nutrition to manage medical conditions, recover from illness or surgery, and improve overall health. Their scope goes well beyond general healthy-eating advice. RDs provide nutritional counseling, create individualized meal plans, run nutrition education programs, and deliver medical nutrition therapy for conditions like diabetes, heart disease, kidney disease, cancer, eating disorders, food allergies, and swallowing problems.
Medical nutrition therapy (MNT) is a key distinction. This is a clinical intervention where a dietitian designs a therapeutic diet tailored to a patient’s diagnosis, monitors progress, and adjusts the plan over time. In people with type 2 diabetes, for example, MNT delivered by a registered dietitian has been shown to lower HbA1c (a measure of long-term blood sugar control) by 0.3 to 2.0 percentage points. One study found that after just 12 weeks of MNT, participants also saw meaningful drops in blood pressure, fasting blood sugar, cholesterol levels, and BMI. These are the kinds of measurable clinical outcomes that set RDs apart from general wellness coaches.
Education and Training Requirements
Becoming a registered dietitian requires years of formal education and hands-on training. As of January 1, 2024, the minimum degree requirement shifted from a bachelor’s degree to a graduate degree. Anyone seeking to take the registration exam for the first time now needs a master’s degree or higher from an accredited institution.
There are several pathways to get there. Some programs integrate graduate coursework with supervised practice in a single coordinated program. Others split the process: you complete a didactic (classroom-based) program first, then apply separately for a dietetic internship. Regardless of the pathway, every candidate must complete at least 1,000 hours of supervised experiential learning in clinical, community, and food service settings. These hours are where aspiring dietitians apply what they’ve learned in real patient care, often rotating through hospitals, outpatient clinics, and public health programs.
After finishing their degree and supervised practice, candidates sit for a national registration exam administered by the Commission on Dietetic Registration (CDR). Passing this exam earns the RD or RDN (Registered Dietitian Nutritionist) credential. To keep it, dietitians must complete 75 continuing professional education units every five years, including at least one unit focused on ethics or health equity.
RD vs. Nutritionist
This is the single most common source of confusion. While all registered dietitians are nutritionists, not all nutritionists are registered dietitians. The term “nutritionist” is largely unregulated in most states. Anyone can use it, whether they hold a PhD in nutrition science or completed a weekend online course. A few states, like Washington, do require nutritionists to hold credentials, but even there the requirements are less strict than for dietitians.
The practical differences matter. Only RDs are trained to provide medical nutrition therapy, which includes prescribing therapeutic diets and managing specialized feeding methods for patients who can’t eat normally. Only RDs can bill insurance companies for their services, because doing so requires both state licensure and a national provider number. If you’re managing a medical condition and want nutrition care that’s covered by your health plan, you need a registered dietitian.
Specialty Certifications
Beyond the general RD credential, dietitians can pursue board-certified specialist credentials in focused areas of practice. The Commission on Dietetic Registration currently offers eight specialty certifications:
- Oncology Nutrition, working with cancer patients
- Renal Nutrition, for kidney disease management
- Pediatric Nutrition and Pediatric Critical Care Nutrition
- Gerontological Nutrition, focused on older adults
- Sports Dietetics
- Obesity and Weight Management
- Digestive Health
These certifications signal advanced expertise and typically require documented practice hours in the specialty area plus an additional exam. If you’re dealing with a complex condition like chronic kidney disease or undergoing cancer treatment, seeking out a board-certified specialist can connect you with someone who has deep experience in that specific area.
Where Dietitians Work and What They Earn
Hospitals are the largest employer of registered dietitians, accounting for about 26% of positions. After that, roughly 12% are self-employed (often running private counseling practices), 11% work for government agencies, 9% work in nursing and residential care facilities, and 7% work in outpatient care centers.
The median annual pay for dietitians and nutritionists was $73,850 in 2024, or about $35.50 per hour. Pay varies by setting. Outpatient care centers tend to offer the highest wages at around $79,200 per year, followed by hospitals at $75,650 and government positions at $74,000. Nursing and residential care facilities pay somewhat less, with a median of $70,180. Dietitians in private practice have more variable incomes depending on their client base, location, and whether they accept insurance.
How to Find a Registered Dietitian
If you’re looking for a qualified dietitian, verify that they hold the RD or RDN credential. You can search the Academy of Nutrition and Dietetics’ online directory to find practitioners by location and specialty. Many primary care doctors can also refer you directly, and if you have a chronic condition like diabetes or heart disease, your insurance plan may cover a set number of MNT sessions with an RD each year.
When evaluating any nutrition professional, asking about their credential is the simplest filter. The letters “RD” or “RDN” after someone’s name confirm they’ve completed an accredited graduate program, logged at least 1,000 supervised practice hours, passed a national exam, and maintain their credential through ongoing education. No other nutrition title in the United States carries that same level of standardized training and accountability.