Health is the level of functional and metabolic efficiency of a living organism.

In biology, an organism is any individual entity that exhibits the properties of life.

Metabolism is the set of life-sustaining chemical reactions in organisms.

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In humans it is the ability of individuals or communities to adapt and self-manage when facing physical, mental or social changes.

Humans are the only extant members of the subtribe Hominina, a branch of the tribe Hominini belonging to the family of great apes.

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The World Health Organization 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."

Well-being, wellbeing, welfare or wellness is a general term for the condition of an individual or group, for example their social, economic, psychological, spiritual or medical state; a high level of well-being means in some sense the individual or group's condition is positive, while low well-being is associated with negative happenings.

The World Health Organization is a specialized agency of the United Nations that is concerned with international public health.

A disease is a particular abnormal condition, a disorder of a structure or function, that affects part or all of an organism.


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".


Other definitions have been proposed, among which a recent definition that correlates health and personal satisfaction.


Classification systems such as the WHO Family of International Classifications, including the International Classification of Functioning, Disability and Health and the International Classification of Diseases, are commonly used to define and measure the components of health.

The International Statistical Classification of Diseases and Related Health Problems, usually called by the short-form name International Classification of Diseases, is the international "standard diagnostic tool for epidemiology, health management and clinical purposes".

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