Generally, people take one of two routes when it comes to the maintenance of their overall health. Some people put all their faith in doctors and modern medicine while others take matters into their own hands.
Functional Medicine is a type of alternative medicine or lifestyle you might call it. People who use functional medicine tend to rely less on health care professionals and medications and more on alternative methods. A person who follows this lifestyle likely sees healthy diet, exercise and stress reduction as the main things that will keep them healthy. When something does go wrong, they use natural supplements, herbs, essential oils, acupuncture, meditation and other more natural ways of healing the body. Modern medicine is a last resort.
If you are interested in practicing this type of lifestyle, there are many resources, including books and websites, dedicated to the subject. Speaking with a professional in the field is also a good route to take to see if this type of natural approach to health is right for you.