Excess body weight is a significant and preventable risk factor for breast cancer, particularly in postmenopausal women, according to medical experts. Doctors emphasize that being overweight not only increases the likelihood of a first-time diagnosis but also raises the risk of cancer recurrence after treatment. Excess body fat can alter hormonal and metabolic environments, promoting cancer growth, especially as fat tissue becomes a primary estrogen source after menopause, stimulating hormone-sensitive cancers.