Boosts Immune System

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On 21 April 2003 the Brigham and Women’s Hospital released details of a research project which indicated that theanine may help the body’s immune system response when fighting infection, by boosting the disease-fighting capacity of gamma delta T cells. The study included a four-week trial with 11 coffee drinkers and 10 tea drinkers, who consumed 600ml of coffee or green or oolong tea daily. Blood sample analysis found that the production of anti-bacterial proteins was up to five times higher in the tea-drinkers, an indicator of a stronger immune response.