Those are really two separate, but integrated questions. Maintaining good health is the first line of defense. The pillars of health and wellness mentioned above is a good place to turn to for resources on emotional and behavioral health, exercise, nutrition, and relationship health and self-care. Pick the description that matches your situation best to learn more. 

But even efforts to maintain health can falter. It may be your own, a family member, or someone else you care about. When you have a diagnosis, the questions are about pragmatic steps you need to take. Medical One Page Helpers can help you. They aren’t a substitute for medical care, put can provide action steps and check lists to help you support treatment for nearly 60 conditions. They include keys to success to lay out what you should do and why, a shopping guide to tell you what foods will help and why, and a supplement guide to tell what to use and why.