It is not fully understood why individuals follow unhealthy lifestyles. A lifestyle is a combination of habitual and conventional ways of doing things. Living environment strongly affects lifestyle. Most individuals adopt unhealthy lifestyles if they are placed in an environment that does not support healthy diet and exercise habits.
Stress is known to promote the adoption of unhealthy lifestyles. Knowledge has an impact on lifestyle choices. However, even individuals who are fully aware of the detrimental health impact of lifestyle practices may persist in doing them. Beliefs and attitudes may affect lifestyle choices. Peer pressure and conventional norms also affect lifestyle choices.