From the Canadian School of Natural Nutrition:

A Registered Holistic Nutritionist™ or R.H.N, is a professional trained in Natural Nutrition and complementary therapies, whose principal function is to educate individuals and groups about the benefits and health impacts of optimal nutrition. A Holistic Nutritionist addresses the interrelationship between the body, mind and the spirit, and the uniqueness of each individual.

Holistic Nutritionists work with clients to identify and help correct the nutritional causes of diseases, and design personalized diet and lifestyle programs that optimize health. Although most people are aware of the benefits of sound nutrition, the range of conflicting information available to the consumer is often confusing. Holistic nutritionists guide their clients through the maze of information from books, magazines, supplements and diets on the market.