off insulin? >> some patients will come off it within hours if not days of surgery. >> studies in the "new england journal of medicine" suggest the weight loss surgery which works by reducing the size of the stomach and intestines is even more effective than medication. obese diabetics who had the surgery had normal blood sugar. even two years later. the group who didn't have surgery all still diabetic. amazingly, the change happens before the pounds come off. doctors are still studying why. they think it may have to do with hormonal changes in the intestines. >> diabetes controlled my life. i was so worried that i was going to die. >> reporter: katie had the surgery three years ago. she considers her diabetes cured. >> give me three words to describe katie now. >> healthy. healthy, healthy, healthy. >> healthy, and it was the operating room that made her that way. >> these two studies were small and short-term. and this is big surgery with side effects. before recommending this more broadly, i'd like to see larger, longer studies which look at the long-term side effects and how

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