That is a good question with a complicated answer. Every patient is unique in this regard. It depends upon how much weight you lose and how resilient your skin is to re-contour/ shrink. We like patients to be near their stable healthy weight because with large weight changes after surgery some additional skin stretch and/or excess can occur. However, I have had patients get pregnant after a tummy tuck (Surprise Baby!) and did great and didn't need any revision. I have had patients that lost 20 lbs and developed loose skin. A person's genetics are the biggest factor. However, ideally a person has a BMI below 30, is healthy and fit and dedicated to leading a healthy lifestyle after surgery. Being and american (a little pudgy) myself, I can't say I even meet those criteria all the time. Best of luck.