Enlarged breasts on men can be an embarrassing issue. This issue can be caused by lifestyle factors as well as an hormonal imbalance in your body, a medical condition known as gynecomastia.  You can take practical steps to address this issue if you have enlarged breasts due to weight gain or gynecomastia. Work on managing your breast size by maintaining a healthy diet and doing exercises to strengthen your chest and burn body fat. If your enlarged breasts are caused by a hormonal imbalance, talk to your doctor about medical treatment options.