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A registered dietitian (RD) or registered dietitian nutritionist (RDN), is a dietitian who meets all of a set of special academic and professional requirements, including: 1  the completion of a bachelor's degree with an accredited nutrition curriculum. registered dietitian (RD) or registered dietitian nutritionist (RDN), is a dietitian who meets all of a set of special academic and professional requirements, including: 1  the completion of a bachelor's degree with an accredited nutrition curriculum.
Nutrition specialists may be dietitians or nutritionists, each of which require different certification and education. Registered dietitians must be certified nationally after acquiring a bachelor's degree in a field related to physiology, food service management, biochemistry or culinary arts.Certified nutrition specialists, or nutritionists, are health professionals specializing in diet, food and nutrition.nyone interested in pursuing the Registered Dietitian credential must earn a bachelor's degree from an institution of higher education accredited by the Commission on Accreditation for Dietetics Education.