The most effective prevention strategies are those we do without even thinking about them. Many serious illnesses are much less common among people who eat quite a lot of fruit and vegetables, get plenty of exercise, and do not smoke. If you do not have a particularly high risk of getting specific diseases, daily lifestyle alone can make an important difference to your health. For those who have a higher risk, it can be a good idea to take certain preventive measures too. Prevention is also key to avoiding infectious illnesses and injuries, and maintaining sexual health and mental health.