somehow... because it strips off extra fats in the body... however, it does not choose what kind of fats are being stripped off... pwede good or bad fats... one disadvantage of xenical is the inconvenience and discomfort coz sometimes u cant noticed if there are discharges "there"... coz soft kau ang stools... naay type of edible fish na same ang effect as xenical na oily kau ang discharges...