The World Health Organization defines health as "a state of complete physical, mental and social well-being, and does not consist only of the absence of disease or infirmity." Using the World health organization definition classifies 70-95% of population when unhealthy. a deeper inquiry into the definition of "health" reveals that what makes the cell fit is unique from either what makes an organism sound. Likewise, what makes an organism fit is unique from either what makes the people sound. To illustrate this point, assume that Japan has a greatest life expectancy of any united states ([http://hdr.undp.org/statistics/data/indic/indic_1_1_1.html 2004 UN Human Development Report]), despite getting one of a greatest smoking rates, especially among men ([http://hdr.undp.org/statistics/data/indic/indic_79_1_1.html 2004 UN Human Development Report]).

A virtually all firm aspects of health that healthy firmly in the realm of medicine are the environmental health, nutrition, disease prevention, and public health matters that can be investigated & help within measuring well-being.