Dietitian: An accredited health professional who has university qualifications consisting of a 4-year Bachelor Degree in Nutrition and Dietetics followed by a Master's Degree, and a period of practical training in different hospital and community settings for a minimum of 1200 hours. Some dietitians also further their knowledge and skills by pursuing various Specialist Dietetic qualifications. The Registered Dietitian Nutritionist is the expert in prescribing therapeutic nutrition. 

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Nutritionist-a non-accredited title that may apply to somebody who has done a short course in nutrition or who has given themselves this title. The term Nutritionist is not protected by law in almost all countries so people with different levels of and knowledge can call themselves a “Nutritionist”.