For many other factors, we are just beginning to understand their role in breast cancer risk.

A diet rich in fruits, vegetables and fiber may be associated with a lower risk of breast cancer. As was previously mentioned, a higher consumption of alcohol has been associated with more exposure to the hormone estrogen and a higher risk of breast cancer.

Being overweight after menopause is associated with higher breast cancer risk. That is why regular exercise is important to help control body weight.

There is concern that exposures to certain environmental chemicals may lead to a higher risk of breast cancer. This includes some types of dyes, flame retardants, solvents, passive cigarette smoke, certain pharmaceutical drugs and several pesticides.