Women who ate soy regularly as children have a lower risk of breast cancer, American researchers report. And men who eat fish several times a week have a lower risk of colon cancer, a second team of researchers have told the American Association for Cancer Research.

    據(jù)美國研究人員報告，兒童時期經(jīng)常吃豆類食品的女性患乳腺癌的風(fēng)險較小。另一組研究人員則向美國癌癥研究協(xié)會提出，一周吃幾次魚的男性患結(jié)腸癌的幾率較小。

    The studies add to a growing body of evidence about the role of diet in cancer. Cancer experts now believe that up to two-thirds of all cancers come from lifestyle factors such as smoking, diet and lack of exercise.

    這兩項研究進一步證明了飲食對于防癌的作用。癌癥防治專家認為，在所有種類的癌癥中，多達三分之二都是由吸煙、節(jié)食及缺乏鍛煉等生活方式造成的。

    The US National Cancer Institute and researchers at the University of Hawaii found that women who ate the most soy-based foods, such as tofu and miso, when aged 5 to 11, reduced their risk of developing breast cancer by 58 per cent. It was not clear how soy might prevent cancer, though compounds in soy called isoflavones have estrogen- like effects.

    美國全國癌癥研究所和夏威夷大學(xué)的研究人員發(fā)現(xiàn)，在5歲至11歲時經(jīng)常吃豆腐、味噌等豆類食品的女性患乳腺癌的幾率要低58%。至于豆類食品為什么可以防癌還不清楚，不過大豆中所含的名叫異黃酮的化合物具有雌性激素的作用。

    A second study showed that men who ate fish at least five times a week had a 40 per cent lower risk of developing colorectal cancer compared with men who ate fish less than once a week.

    另一項研究表明，一周吃魚至少五次的男性患結(jié)腸癌的風(fēng)險要比那些一周都吃不到一次魚的男性低40%。

    Many kinds of fish are rich in omega-3 fatty acids, which interfere with the cyclooxygenase-2 or COX-2 enzyme. COX-2 affects inflammation, which may play a role in tumour growth.

    很多魚類中所富含的Omega-3脂肪酸能夠抑制環(huán)氧化酶2的活性。環(huán)氧化酶2會引起發(fā)炎，這可能會刺激腫瘤的生長。