Public health is the science of protecting and improving the health of people and their communities. This work is achieved by promoting healthy lifestyles, researching disease and injury prevention, and detecting, preventing and responding to infectious diseases. Overall, public health is concerned with protecting the health of entire populations. These…

Human Nutrition—the study of food and nutrients, their consumption, absorption, metabolism and health effects—intersects broadly with science, society and individual behavior. This section focuses on macro and micronutrients and other food substances, their sources, functions, deficiency diseases, and contribution to health maintenance throughout the life cycle. Also included is information…

Epidemiology is the study of how often diseases occur in different groups of people and why. Epidemiological information is used to plan and evaluate strategies to prevent illness and as a guide to the management of patients in whom disease has already developed.