Nutrition is the study and application of the relationship between diet, foods and health. The challenges facing nutritionists today range from problems of obesity and chronic diseases to those of malnutrition, food insecurity and nutritional deficiencies.  Nutritionists work in hospitals and clinics, communities, and institutions throughout the world.  Nutritionists provide dietary counseling and education, conduct research, develop menus and foodservice systems, and deliver many other services for individuals and populations.