A dietitian is an expert in dietetics; that is, human nutrition and the regulation of diet. A dietitian alters their patient’s nutrition based upon their medical condition and individual needs. Dietitians are regulated healthcare professionals licensed to assess, diagnose, and treat nutritional problems .Dietitians promote good dietary health and treat nutritional problems by providing practical advice about food choices, based on scientific research. The ability to interact well with people from a wide range of backgrounds is essential. Dietitians work on a group and an individual basis with people of all ages.