Dr. Oz and Dr. Smith have one message for anyone who thinks they may be at risk for diabetes: Don't wait to get tested. "Almost always you can reverse it," Dr. Oz says. "What you can't always reverse are the side effects of what that glass shrapnel has already done inside of you."

If you already have diabetes, make sure you are on top of your condition. "Diabetes is years and years and so you don't feel the immediate effect of it, and that's why people say, 'I'll make a change tomorrow,'" Dr. Smith says. "Why wait until it's a crisis situation? Wait until the doctor says that you have to take insulin or you're going to have an amputation? Do something about it now."

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