What is health? How can I tell if I am healthy? Can I control my own health? How can I influence my future health? You may have just begun to ask yourself questions like these. At one time you might have said that a healthy person is anyone who does not have a cold or some other illness. Now that you are older, you may realize that this definition does not include all the things that cause you to feel well or to be healthy. - p. 2.