The debate over which carbohydrates are good or bad is a big "lack-of-consensus issue," as there is no standard way to determine quality, says Dr. Dariush Mozaffarian of the Harvard School of Public Health. Carbohydrates in processed foods and refined grains are generally considered bad. To determine which carbs are better, four factors -- dietary fiber, the effect on blood glucose, whole-grain content and structure -- should be evaluated, Mozaffarian says.

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