Coffee Is Not Carcinogen but Very Hot Beverages Are, Researchers Say

Coffee Is Not Carcinogen but Very Hot Beverages Are, Researchers Say
According to a working group from WHO's International Agency for Research on Cancer, coffee should not be classified as carcinogenic to humans, but very hot beverages should. The group's report, "Carcinogenicity of drinking coffee, mate, and very hot beverages," has been published in The Lancet Oncology. Coffee is one of the world's most consumed beverages, whose carcinogenicity was last assessed in 1991. At that time, coffee was considered "possibly carcinogenic to humans," based on limited data from case-control studies linking coffee consumption with bladder cancer, even though there was no evidence of carcinogenicity in experimental animals. There was also evidence for a lack of carcinogenicity in breast and large intestine cancers. Recently, a working group composed of 23 scientists from 10 countries met in Lyon, France, where they examined more than 1,000 observational and experimental studies evaluating coffee consumption and cancer development, where important confounders, such as tobacco and alcohol consumption, were adequately controlled. "The working group concluded that positive associations reported in some studies could have been due to inadequate control for tobacco smoking, which can be strongly associated with heavy coffee drinking," wrote Dana Loomis, Ph.D., deputy head of the section of IARC monographs at the International Agency for Research on Cancer. From the analysis of 10 cohort studies, an evidence of an association with coffee drinking and bladder cancer was no longer foun
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