Weight. Being overweight is associated with increased risk of breast cancer, especially for women after menopause. Fat tissue is the body’s main source of estrogen after menopause, when the ovaries stop producing the hormone. Having more fat tissue means having higher estrogen levels, which can increase breast cancer risk. Diet. Studies are looking at the relationship between diet and breast cancer risk and the risk of recurrence. The Women’s Health Initiative Trial suggested that a diet very low in fat may reduce the risk of breast cancer. More research is needed in this very important area for women who are interested in eating well to reduce their risk of ever getting breast cancer.
Source: NCI 2019