Abstract
An urbanized society demands continuous activities of various city functions. Such tendency called “24-hour society” brings about adverse effects on health. The circadian rhythm characteristics of city inhabitant could change by an extreme evening type life style or irregular work hours. One of the important phenomenon, which is thought to be a physiological consequence of irregular life style, is desynchronization of circadian rhythm. Alcohol dependence, work-related diseases, increased rate of psychosomatic complaints in school children are another examples of adverse effects of urbanization and disturbed social life rhythm. The promotion of “Healthy City” is necessary in order to solve these health problems and to achieve healthy as well as comfortable cities in the future.
