Non-surgical thin stomach sleeve allows for weight loss and is removable 10/23/2013 - 00:00 People struggling with severe obesity are increasingly turning to bariatric, or weight-loss, surgery. But the procedure is invasive, irreversible and not without risks. A new study conducted on rats describes a nonsurgical approach using an experimental "gut sleeve" procedure.It's hoped that if the procedure eventually works in humans, it may provide a more effective and less expensive alternative to weight-loss surgery, and reduce related health problems.