When you had your gynecomastia surgery, many of the fat cells were likely removed from your chest area. If you gain weight afterwards, you will likely see a greater increase in a different area of the body. I always recommend a healthy diet and active lifestyle before and after surgery. You may also want to discuss this with your plastic surgeon or primary care provider.
Thank you for your question. The fat from your chest didn't move to your belly. It is likely from weight gain .