A popular artificial sweetener that's widely found in sugar-free foods and beverages is being labeled as a possible cancer risk by the World Health Organization (WHO). WHO's cancer research agency, International Agency for Research on Cancer (IARC), determined aspartame to be a possible carcinogen after reviewing and assessing the potential carcinogenic effect of the sweetener, but says it's safe to consume in limited amounts.

Dr. Donald Hensrud, a Mayo Clinic physician specializing in nutrition and the editor of "The Mayo Clinic Diet," explains what this new classification means and why the risk is low.
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