The results of abdominoplasty surgery are less dependent on gravity, and more on maintenance of ideal weight, or in the very least the stable weight at which the abdominoplasty was performed. Gaining weight will not only add unwanted adipose tissue but also stretch out abdominal skin, in essence partially reversing the intent of the original surgery, not to mention the havoc weight gain can wreak on abdominoplasty incisions. Ideally, one tummy-tuck surgery should be all you need.