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Researchers conducted an observational study based on anonymous questionnaires to determine the association between green tea consumption and the incidence of influenza infection (confirmed by antigen test) among schoolchildren between the ages of 6 and 13 years. Surveys were undertaken twice during the influenza season from November 2008 to February 2009 in 2,663 pupils across all elementary schools in Kikugawa City, Japan. Researchers found a benefit to consuming daily between 1-5 cups of green tea, but no greater advantage to drinking more than 5 cups per day. These findings suggest that 1-5 cups of green tea per day may prevent influenza in children.
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