If surgery is performed, will the results be permanent? What if I gain weight after the surgery?

Surgery will remove much, but not all of the breast tissue and it will not re-grow (much as a woman’s breast will not re-grow after a mastectomy for breast cancer). Should you gain substantial weight after surgery, then some amount of fat will return to the chest but it will also be distributed over other parts of the body so that you will not regain the specific enlargement on the chest that you had prior to surgery. Conversely, if you lose weight after gynecomastia surgery, the results of the surgery will be enhanced.