The terms “registered dietitian” (RD) and “nutritionist” are often used interchangeably, but there is a key difference between the two. A registered dietitian is a credentialed health professional who has met rigorous education, examination, and experience requirements. A nutritionist, on the other hand, is not a protected term and can be used by anyone, regardless of their education or qualifications. In general, it is best to see a registered dietitian for nutrition counseling. RDs have the education, training, and experience to provide evidence-based nutrition advice that can help you achieve your health goals.