Although nothing can guarantee a life free from cancer, you can practice healthy habits to reduce your risk.
The best opportunities for reducing breast cancer risk are eating a healthy diet and being physically active throughout life (thereby maintaining a healthy body weight), minimizing alcohol consumption and avoiding tobacco as well as nonessential hormones.
The World Cancer Research Fund International
reveals lifestyle changes to lower the risk of breast cancer. Experts estimate that about a third of cancers could be prevented by choosing a healthy diet, being physically active, and maintaining a health weight. Evidence suggests that some types of cancer are more preventable than others.
Also see Breast cancer prevention: Lifestyle factors that can reduce risk
from the Mayo Clinic.