If pressed to name just one thing that you can do to improve your health, it would be this:
Don't ignore discomfort; whenever you don't feel well, try to identify and address the root cause(s) of your symptoms.
Conventional medical practice would have us believe that prevention entails being diligent in going for regular diagnostic testing. This is screening for disease once it is already well under way; it is nothing remotely close to exercising true prevention of disease. Read more about The Surest Way To Improve Your Health