The World Health Organization (WHO) defines health as "a state of complete physical, mental, and social well-being."
Policy Making
Several policies may affect individual and population health. Increasing taxes on cigarettes discourage people to purchase them, thus indirectly improving health, if they ought not to buy.
Social Factors
Reflect the physical conditions of the environment in which people are born, live, learn, play, work, and age. Also known as social and physical determinant of health.
Health Services
Availability and access to healthservices can impact health. For example, when individuals do not have health insurance, they are less likely to participate in preventive care and are more likely to delay medical treatment.
Individual Behavior
Greatly affects health improvement or health deterioration. Example, if one quits smoking, their risk of having cardiopulmonary conditions or diseases is exponentially improved overtime.
Biology and Genetics
For example, older adults are biologically prone to being in poorer health than adolescents due to the physical and cognitive effects of aging.