Exercise. Evidence is growing that exercise can reduce breast cancer risk. The American Cancer Society recommends engaging in 45-60 minutes of physical exercise 5 or more days a week. Alcohol consumption. Studies have shown that breast cancer risk increases with amount of alcohol a woman drinks. Alcohol can limit your liver’s ability to control blood levels of the hormone estrogen, which in turn can increase risk. Smoking is associated with a small increase in breast cancer risk.
Source: NCI 2019