Breast cancer is one of the many health risks that a woman has to worry about, but just a few changes could actually reduce the risk of developing breast cancer by approximately 40 percent. There are approximately 70,000 cases of breast cancer annually in the United States, of which some could be prevented with liifestyle changes such as eating a healthy diet, breastfeeding their infants, getting 30 to 60 minutes of exercise every day and limiting their alcohol consumption.