This is an interesting question, unfortunately I have limited knowlege of xenical so I would'nt want to speculate. I really havn't seen these drugs being used in our circles for dieting purposes and certainly am interested to find out if anyone has and thier experiences. It does prevent absorption of fats leading basically to a reduction in calories which makes it effective for people whom can't controll their diets, but most of us in this game can, so it may really have no proctical purposes for us. But at the same time it may. A hard training body needs fats, so it may actually pose more problems than good, but again I don't fully understand it's full actions and it would be good to learn more about it so basically this is an elongated BUMP.