Sleep in Total Darkness; avoid any lights in your bedroom at night. The body needs total darkness to produce melatonin, an important anti-cancer hormone.
Get Plenty of Exercise; doesn't need to be strenuous, just steady on a regular basis.
Avoid Chlorinated Water; use a filter for your shower or bath, and, of course, don't drink chlorinated or fluoridated water for that matter.
Limit Radiation Exposure; all radiation exposure is cumulative, so be aware of all x-rays, MRI's, long airline flights, and even mammography! Thermography is an alternative to mammography worth exploring.
Avoid Vegetable Oils; vegetable oils are one of the major contributors to inflammation and degenerative disease and very likely a major cause of cancer. They are found in so many foods and many people cook with them when they could use safer, health-promoting oils like olive and coconut.
In the final analysis, I trust Mother Nature more than science. And human beings are notoriously flawed when it comes to discerning cause and effect.
I believe, especially in complex matters, that what we don't know greatly eclipses what we do know; therefore I cannot trust in the limited knowledge of (mostly) men in white coats. I can trust in the unlimited, infinite wisdom and power of Mother Nature. Why would I do drastic things like surgery, while all the while I have the option to do simple, harmless, proven preventative measures--only fear can be the answer.
The notion to which I object so strongly is the idea that these easy, inexpensive, preventative measures don't hold power. Why does Ms. Jolie infer that power only means powerful science, very invasive and dramatic procedures, while, by default, ignoring simple ones? The truth is our daily choices hold tremendous opportunities to enhance wellness and protect us from diseases like cancer. Is any prevention 100% effective? Of course not, but again, Mother Nature has a longer proven track record than what we call modern medicine.
NOTE: Following is a link to the May 16, 2013 edition of The Gary Null Show in which he discusses the issue in some depth with Dr. Christiane Northrup.