In this paper, the author attempts to describe, through human ecology, the theoretical origins of healthy lifestyles in people of all societies followed by an exploration of how such lifestyles can be replaced by unhealthy ones. He has identified physical and mental injury, disease or illness, as the causes of these unhealthy lifestyles In conclusion, he suggests the implementation of higher standards of care by nurses and other health workers as one way of restoring healthy lifestyles or delaying their deterioration in those people who acquire them