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Last on Dr. Oz's top five list is fasting blood sugar. "Imagine taking nails and scraping the lining of [an] artery," he says. "That's what blood sugar does."

Dr. Oz says your fasting blood sugar should be less than 100. The higher the number, the higher your risk of heart disease, stroke, kidney failure and impotence. "[It's an] easy test to get done, and you want to do it roughly six to eight hours after having a meal so you give your body really enough time to get rid of any extra sugar that you may have had last night," he says. "We do it usually in the morning." 

Watch Dr. Oz elaborate on these five numbers after the show

More to Know for 2011
Bob Greene's 5 ways to keep the weight off

Peter Walsh's strategies to clear everyday clutter

Adam Glassman reveals what every woman needs in her closet

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