Preventive healthcare (preventive medicine or prophylaxis) consists of measures taken for disease prevention. It relies on anticipatory actions, as opposed to disease treatment.
Each year, millions of people die of preventable deaths. A 2004 study showed that about half of all deaths in the United States in 2000 were due to preventable behaviors and exposures. Leading causes included cardiovascular disease, chronic respiratory disease, unintentional injuries, diabetes, and certain infectious diseases. 400,000 people die each year in the United States due to poor diet and a sedentary lifestyle.