Health is the ability of a biological system to acquire, convert, allocate, distribute, and utilize energy with maximum efficiency. The World Health Organization (WHO) defined human health in a 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.
More specifically, key factors that have been found to influence whether people are healthy or unhealthy include the following:
Income and social status
Social support networks
Education and literacy
Personal health practices and coping skills
Healthy child development
Biology and genetics
Health care services
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