A dietitian or dietician is an expert in food and nutrition. Dietitians help promote good health through proper eating. They often write custom diets for people. In a medical setting they can give food supplements for those people who cannot get what they need because of swallowing problems. Dietitians want to find, cook and serve tasty, attractive and healthy food to patients, their families and healthcare providers.
In many countries only people with specific degrees or certifications can call themselves dietitians. The term nutritionist is widely used as it is not controlled like the title dietitian, but the word nutritionist can be used without having the qualifications of registered dietitians. A nutritionist is not a dietitian as he is not registered to a national board and does not have the same qualifications. Dietitians are important in the medical multidisciplinary team because they are experts in nutrition and can give advice to doctors, nurses, and other health care workers. Dietitians supervise the preparation and service of food, help in research, and teach people on how to eat well.
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Source: Data courtesy of the U.S. National Library of Medicine. Since the data might have changed, please query MeSH on Dietitian for any updates.