Nutritional Sciences: The study of NUTRITION PROCESSES as well as the components of food, their actions, interaction, and balance in relation to health and disease.Sports Nutritional Sciences: The study of NUTRITION PROCESSES during EXERCISE and ATHLETIC PERFORMANCE as well as specific NUTRITIONAL REQUIREMENTS of ATHLETES and the relationship between NUTRITIONAL STATUS and NUTRITION DISORDERS in athletes.Dietetics: The application of nutritional principles to regulation of the diet and feeding persons or groups of persons.Nutritional Physiological Phenomena: The processes and properties of living organisms by which they take in and balance the use of nutritive materials for energy, heat production, or building material for the growth, maintenance, or repair of tissues and the nutritive properties of FOOD.Science: The study of natural phenomena by observation, measurement, and experimentation.Diet: Regular course of eating and drinking adopted by a person or animal.Social Sciences: Disciplines concerned with the interrelationships of individuals in a social environment including social organizations and institutions. Includes Sociology and Anthropology.Biological Science Disciplines: All of the divisions of the natural sciences dealing with the various aspects of the phenomena of life and vital processes. The concept includes anatomy and physiology, biochemistry and biophysics, and the biology of animals, plants, and microorganisms. It should be differentiated from BIOLOGY, one of its subdivisions, concerned specifically with the origin and life processes of living organisms.