♪ welcome back. new research offering hope to the many folks, millions of those suffering with diabetes. >> huge medical story here. two new studies show surgery can reverse and even possibly cure the disease. abc's dr. richard besser reports on this big advance. >> reporter: just 72 hours after weight loss surgery, randy cardy hasn't lost a pound. but his diabetes is gone. >> your days of medication for diabetes are over for the rest of your life. >> outstanding. >> reporter: he and his wife will no longer worry about the possible consequences of long-term type 2 diabetes, blindness, amputation, kidney failure. that's why the two studies are so exciting. this surgery may reverse this condition almost instantly. >> how quickly might they come

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