Health is the level of functional and metabolic efficiency of a living organism. The World Health Organization (WHO) defined human health in its broader sense in its 1948 constitution as “a state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity.This definition has been subject to controversy, in particular as lacking operational value, the ambiguity in developing cohesive health strategies, and because of the problem created by use of the word “complete”, which makes it practically impossible to achieve. Other definitions have been proposed, among which a recent definition that correlates health and personal satisfaction.
An alternative approach focuses on avoiding definitions, which demand precise descriptions of the term. Instead, following a three-year global conversation, convened by Alex Jadad, “health” has been conceptualized as the ability to adapt and self manage when individuals communities face physical, mental or social challenges.