Health is the level of functional or metabolic efficiency of a living organism. In humans, it is the ability of individuals or communities to adapt and self-manage when facing physical, mental, or social challenges. The World Health Organization (WHO) defined 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 and because of the problem created by the use of the word "complete" Other definitions have been proposed, among which a recent definition correlates health and personal satisfaction. Classification systems such as the WHO Family of International Classifications, including the International Classification of Functioning, Disability, and Health (ICF) and the International Classification of Diseases (ICD), are commonly used to define and measure the com
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