All types of health are related, and people should aspire to overall well-being and balance as keys to good health. According to the National Institute of Mental Health, people who smoke tobacco, drink alcohol or use illicit drugs to manage stressful situations are more likely to develop health problems than those who manage stress through a healthy diet, relaxation techniques, and exercise. Good physical health can work in conjunction with mental health to improve a person's overall quality of life. In 1948, the World Health Organization (WHO) defined health with a phrase that modern authorities continue to apply.
Department of Health %26 Human Services, mental health refers to a person's emotional, social and psychological well-being. It is more difficult to define mental health than physical health because many psychological diagnoses depend on the individual's perception of their experience.