This field is relevant to both the health and nutrition industry. Nutrition and dietetics is the application of food and nutritional knowledge to improve health and prevent or minimize disease. The branch of nutrition and dietetics conducts scientific studies on the application of diet, preparation of foods and nutritional intake in health and disease. Nutrition studies the metabolic and physiological roles of nutrients in the body. Dietetics deals with the treatment of nutrition-related diseases and the prevention of disease complications.