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北海道医师会健康教育中心长小林博教授最近撰文指出:“绿茶”对防癌有意外的效果,呼声颇商。茶里究竟是什么在起作用?做为防癌的先驱,国立癌中心的藤木说:可能是单宁中的儿茶酸在起作用。这种儿茶酸在绿茶中含量很高,乌龙茶仅为它的40%;红茶则只为它的10%。很早就有“饮茶可以长寿”、“茶叶产地静岡县,癌症患者极少”等传说。对哪种癌症有效?经动物实验,把从茶中提取的儿茶酸投给小鼠,可使癌得到有效抑制,对胃癌、结肠癌、肺癌等也有抑制作用。最近得知,烟草中存在一种 NNK 的致癌物质,把它投给老鼠,也和人一样可致肺癌(扁平上皮癌、腺癌)。而把儿茶酸经日投予已经投给 NNK 的鼠,癌的发生率可明显减少,22个投给 NNK 而患肺癌的鼠中,
Professor Hokkaido Kobayashi, director of Hokkaido Physicians’ Health Education Center, recently wrote: Green Tea has an unexpected effect on cancer prevention. What exactly is tea at work? As a precautionary anti-cancer pioneer, the National Cancer Center Fujiki said: It may be tannins in catechin at work. This catechin is high in green tea, Oolong tea is only 40% of it; black tea is only 10% of it. A long time ago, “tea can be longevity”, “tea origin Shizuoka Prefecture, cancer patients rarely” and other legends. Which kind of cancer is effective? Animal experiments, extracted from the tea catechin administered to mice, can effectively suppress the cancer, gastric cancer, colon cancer, lung cancer also have inhibitory effect. It has recently been learned that there is a NNK carcinogen in tobacco that is administered to mice as well as lung cancer (squamous cell carcinoma, adenocarcinoma) just like humans. On the other hand, the incidence of cancer was significantly reduced in catechins administered to NNK mice by day, of 22 rats given NNK and lung cancer,