It is estimated that about 1/3 of the most common cancers can be avoided simply through changes in behavior, diet and exercise. (See here.) Among the recommended changes are avoiding sugary drinks, being physically active for at least 30 minutes a day and eating a larger variety of fruits, vegetables and WHOLE grains. It is never too late to start making changes, and you don't have to change everything at once. Any change, no matter how small, is change for the better. In fact, baby steps are encouraged... you just need to keep making them.