Exercise works for you on several important levels. Most are aware that women athletes often lose their periods. That, of course, is not desirable or healthy. The point is that exercise can be one of your greatest tools in lowering high estrogen levels. Next, ease up on sweets.
Studies show a link between high sugar consumption and breast cancer.
As an added bonus you'll lose unwanted weight and cut your risk of developing Type-II diabetes. This brings them to market weight faster, with less care and feed, thus, increasing profits. Nutritional supplements can further decrease risks of all cancers. RDA's can be compared to minimum wage. Nobody envisions minimum health as their pinnacle of success or their goal, so be good to yourself with vitamins, minerals, and anti-oxidants.