《美国国家科学院院刊》（Proceedings of the National Academy of Sciences）有研究显示，红茶是提升免疫力的一大法宝。波士顿布列根和妇女医院（Brigham and Women's Hospital）以及哈佛医学院合作试验表明，每天喝五杯红茶，并坚持两周的人免疫系统内的T细胞能够产生十倍多的抗流感病毒干扰素。

“We worked out the molecular aspects of this tea component in the test tube and then tested it on a small number of people to see if it actually worked in human beings,” explained Jack F. Bukowski, MD, one of the study's researchers. According to Dr. Bukowski, the results are proof that five cups of tea a day can enhance the body's disease defenses. (Check out these other incredible benefits of black tea.)

研究人员医学博士杰克·F·布科思拷说：“我们用试管分析红茶的分子成分，在一小部分人身上做了实验，看是否有效。”布科思拷表示，结果证明每天喝五杯茶能提高身体的疾病提抗力。

Green tea is another noteworthy flu-fighter thanks to its antioxidant quercetin, as well as an amino acid called L-theanine. Various studies have shown that quercetin acts as a potent antiviral agent, hindering viral replication of many respiratory viruses, including influenza virus. One study, published in the Journal of Medicinal Food found quercetin to inhibit the replication of a common cold virus in its initial stage of infection.

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