The document discusses the evolution of definitions of health over time. It begins by discussing the WHO's original definition of health as a state of complete physical, mental and social well-being. It then describes how later definitions focused more on the body's ability to function and deal with stress. In 1984, the WHO revised its definition again to define health as a resource that allows people to realize their goals and meet needs. More recent definitions see health as the ability to maintain homeostasis and recover from adverse events through mental, intellectual, emotional and social resources.