RD = Registered Dietitian
LD = Licensed Dietitian *
CD = Certified Dietitian *
The term “Nutritionist” when not accompanied by any of the above, simply do not have the credentials that dietitians do! See below for more information. (the ‘N’ at the end of the letters indicates Nutritionist)
* These indicate an additional state licensure/certification, but not all states require it; generally, someone with an RD meets the state standard. The licensure avoids differentiating between licensed and unlicensed nutritionists. In many states, it is legal to give nutrition advice without any credential. In other states, it is prohibited.
In general RD/ RDN + LD/LDN or CD/CDN:
1. Are regulated by US national certification
2. MUST have at least a bachelor’s degree in an accredited dietetics program (as of 2024, must obtain a Master’s degree)
3. MUST complete a rigorous 6m – 1 yr dietetic internship (under experienced RD/RDN)
4. MUST pass rigorous registered dietitian exam
5. MUST participate in continuing education in order to maintain credential
6. Regulated by an ethical code
On the other hand, Nutritionists:
1. May or may not be regulated by any 3rd party organizations.
2. May or may not have a degree in nutrition.
3. May or may not have experience in dietetics.
4. May or may not have a 3rd party verification of qualifications, education and experience
5. May or may not be required to obtain continuing education credits.
There are several other letters that you may see after an RD’s name. These indicate additional education or certifications: PhD (Doctorate degree), MS (Master’s Degree), CSO is (Board Certified Specialist in Oncology Nutrition), CDE (Certified Diabetes Educator), etc.
In a nutshell – do your homework before hiring or even following advice of a nutritionist!!