Nutritionist vs. Dietitian

The term has "nutritionist" has no standard of education or training - anyone could use the title even with no background in this field. If you decide to get help from such a specialist, you need to verify their qualifications.

For example, a PhD in physiology or biochemistry with experience in human nutrition can be a valuable source of dieting advice while a self-named expert who failed to prove his or her credentials can be a worse choice than "dietitians" that can be registered or licensed.

The Registered Dietitian is a nationally recognized title for nutrition expert. The Registered Dietitian is required to complete education and pass a special board exam. There's also official term Licensed Dietitian - these dietitians are licensed by a state to ensure that only qualified professionals provide nutrition services.