Health is a state of complete physical, mental and social well being and not merely the absence of disease or infirmity.

This definition is the preamble from 1946 to the Constitution of the World Health Organization (WHO). This WHO definition has not been amended since 1946. It implies that all basic needs of the individual are met, whether emotional, health, nutritional, social and cultural rights and the stage of embryo or gametes to that of the elderly.

It presents itself as an objective rather than utopian as it may deem certain class, as the country studied, 70 to 99% of people as not healthy or sick. We may prefer that of Rene Dubos: “physical and mental state relatively free of discomfort and pain that allows the individual to function as long as possible in the environment where chance or choice has placed”, which presents health as the convergence of concepts of independence and well-being. It is a relative state. We say that a person is “healthy” or “unhealthy”.

By analogy with human health, also known as the “economic health” of a country, a company in “good health“, etc.

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