What is the Difference Between a Nutritionist and a Dietitian?

“All registered dietitians are nutritionists, but not all nutritionists are registered dietitians.”

The main differences between nutritionists and dietitians lie in scope of practice, education, and where they can practice. 

Education

• RDN: Accredited bachelor’s degree, supervised practicum, national exam (Commission on Dietetic Registration), and — since 2024 — a master’s degree. Requires ongoing continuing education to maintain the title.
• Nutritionist: No standardized requirements. Anyone can use the title, whether they’ve completed a short online course or nothing at all. No exam, no practicum, no mandatory education.

Scope of practice

• RDN: Trained to provide medical nutrition therapy — assessing, diagnosing, and treating nutrition-related health conditions (diabetes, heart disease, kidney disease, GI issues, etc.). Can develop individualized therapeutic nutrition plans and work within healthcare teams.
• Nutritionist: Generally limited to general wellness guidance — lifestyle, meal planning, and preventive advice. They’re not equipped to manage medical conditions or provide clinical therapy.

Where they can practice

• RDN: Healthcare settings — hospitals, clinics, long-term care, public health agencies — plus private practice, schools, sports teams, corporate wellness, and research. They can bill insurance for medical nutrition therapy.
• Nutritionist: Mostly wellness-adjacent spaces — gyms, spas, supplement companies, corporate programs, private coaching. Practice settings vary by state or country because regulation is inconsistent or absent.

Key takeaway: The RDN title is protected and regulated, so the training, scope, and settings are clearly defined and accountable. “Nutritionist” is unregulated — so it’s always worth asking what education and experience sit behind the title.

How does this apply to NYC Nutritionist?

Because we know many people use the two titles interchangeably, we call ourselves NYC Nutritionist so people can find us.

Every member of our team is a Registered Dietitian Nutritionist (RDN), a highly trained professional who completes an accredited bachelor’s degree, a supervised practicum in a real healthcare or community setting, and a rigorous national exam. We then continue learning throughout our careers to stay up to date on the science of nutrition.

As of 2024, earning an RDN requires a master’s degree in an approved area of study. This training is about more than science: it equips dietitians to support people with empathy, respect, and an understanding that health looks different for every body, every culture, and every community.

Because the RDN title is protected and regulated, you can trust that this expertise is backed by education, experience, and accountability. 

The word “nutritionist,” by contrast, is unregulated — anyone can use it, regardless of their training. Well-intentioned as they may be, many lack the rigorous foundation dietitians receive, which can lead to quick fixes and passing fads rather than lasting, sustainable change.

What do dietitians do?

Registered Dietitians do so much more than share meal plans. They work alongside individuals, families, and communities to build food relationships rooted in wellbeing — not restriction, shame, or comparison. Their guidance reflects the latest evidence, while honoring your lived experience, your traditions, your preferences, and your culture’s rich food heritage.

When you’re ready for nutrition care that sees the whole you — your body, your background, your goals — ask for credentials. We’d be honored to walk alongside you.