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Health can be promoted by encouraging healthful activities, such as regular physical exercise and adequate sleep, and by reducing or avoiding unhealthful activities or situations, such as smoking or excessive stress. Still, other factors are beyond both individual and group choices, such as genetic disorders. The population in question can be as small as a handful of people or as large as all the inhabitants of several continents . Public health has many sub-fields, but typically includes the interdisciplinary categories of epidemiology, biostatistics and health services. Environmental health, community health, behavioral health, and occupational health are also important areas of…