"The most widely used of the broader definitions of health is that within the constitution of the World Health Organization (WHO), which defines health as: A state of complete physical, mental, and social well-being, and not merely the absence of disease or infirmity. This classic definition is important, as it identifies the vital components of health. Well-being includes the presence of positive emotions and moods, such as contentment and happiness; the absence of negative emotions, such as depression and anxiety; satisfaction with life, fulfillment and positive functioning. In simple terms, well-being can be described as judging life positively and feeling good. Well-being is associated with numerous health-, job-, family-, and economically related benefits. For example, higher levels of well-being are associated with decreased risk of disease, illness, and injury; better immune functioning; speedier recovery; and increased longevity. Individuals with high levels of well-being are more productive at work and are more likely to contribute to their communities."