Hi Joylmman, In belly-based free flap reconstruction (DIEP, SIEA, msTRAM) surgery, the lower abdominal tissue is repurposed--it is moved from its existing position on the lower abdomen to the chest, and microvascular surgery to connect tiny blood vessels allows the tissue to survive. The shape of your trunk will be positively impacted by the removal, but the skin/fat is moved to its new position. Your weight should be net neutral before and after the surgery (if you have concurrent mastectomies, your weight should be decreased by the weight of the mastectomy specimen(s)). Hope this helps! Best,Christopher Pannucci MDBoard Certified Plastic SurgeonPlastic Surgery NorthwestSpokane, WA