咖啡是风靡全球的饮品,但今后或许也会成为预防癌症的保健品。今天的新托福考试阅读练习资料就来与大家说说最新的有关咖啡预防癌细胞的研究。
Coffee has been linked to a reduced risk of dying from prostate cancer in a study of nearly 50,000 US men.
Those who drank six or more cups a day were found to be 20% less likely to develop any form of the disease - which is the most common cancer in men.
They were also 60% less likely to develop an aggressive form which can spread to other parts of the body.
But charities say the evidence, reported in the Journal of the National Cancer Institute, is still unclear.
They do not recommend that men take up coffee drinking in the hope of preventing prostate cancer.
Unknown compounds
The study looked at about 48,000 men in the US who work as health professionals.
Every four years between 1986 and 2006, they were asked to report their average daily intake of coffee.
During this 20-year period, 5,035 of the men were diagnosed with prostate cancer, including 642 fatal cases.
No difference was seen between caffeinated and decaffeinated coffee, suggesting caffeine itself was not the cause.
But even relatively small amounts of coffee - one to three cups per day - were found to lower the risk of lethal prostate cancer by 30%.
The researchers think there may be unknown compo...