Health is the level of functional and metabolic efficiency of a living organism, and in humans refers to the ability to adapt and self-manage when facing challenges. Maintaining health is an ongoing process shaped by evolving healthcare and personal strategies. Key ways to maintain personal health include eating a nutritious diet with a variety of plant and animal foods, exercising regularly to strengthen muscles and the cardiovascular system, getting sufficient quality sleep, and practicing good hygiene. Personal health also depends on adopting preventive behaviors and receiving medical care when needed.