英國(guó)格拉斯哥大學(xué)的一項(xiàng)新的研究警告稱,，喝茶過(guò)量的男性患前列腺癌的風(fēng)險(xiǎn)較大。那些每天喝7杯以上茶的男性,，患前列腺癌的幾率要比喝3杯以下的男性高近50%,。
研究人員對(duì)6000多名男性的健康狀況進(jìn)行了長(zhǎng)達(dá)近40年的跟蹤調(diào)查，其研究結(jié)果卻和先前的研究截然不同,。
先前的研究指出,，喝茶不僅能降低患癌癥的風(fēng)險(xiǎn)，還能減少患心臟病,、糖尿病和帕金森氏癥的風(fēng)險(xiǎn),。
這項(xiàng)研究于1970年開始，受試者的年齡介于21歲到75歲之間,，他們被要求填寫問(wèn)卷,，內(nèi)容包括平常喝茶、咖啡和酒的分量,，吸煙習(xí)慣，以及整體健康狀況,，受試者還需參加篩檢,。
在6016名男性受試者中，僅有不到1/4的人喝茶過(guò)量,，每天要喝7杯茶,。而這些過(guò)量喝茶者，其中有6.4%的人在接下來(lái)37年里患了前列腺癌,。
發(fā)表在最近出版的《營(yíng)養(yǎng)與癌癥》（Nutrition and Cancer）期刊上的該研究稱,，先前的研究大多顯示，紅茶和前列腺癌并無(wú)關(guān)聯(lián),，或綠茶有些預(yù)防效果,。
目前還不清楚到底茶本身是危險(xiǎn)因子，還是喝茶的人正好是前列腺癌的好發(fā)年齡,。不過(guò),，研究人員稱，喝茶最多的受試者不太可能會(huì)體重過(guò)重或是有飲酒習(xí)慣,，且較可能有健康的膽固醇值,。
研究人員指出,，由于該研究只考慮到受試者飲用茶、咖啡和酒精的量,，沒(méi)有考慮到家族病史及其他飲食情況,，因此不希望任何人誤認(rèn)為，適量飲茶也會(huì)增加患前列腺癌的風(fēng)險(xiǎn),。（生物谷Bioon.com）
doi:10.1080/01635581.2012.690063
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Tea Consumption and the Risk of Overall and Grade Specific Prostate Cancer: A Large Prospective Cohort Study of Scottish Men
Kashif Shafiquea, Philip McLooneb, Khaver Qureshic, Hing Leungd, Carole Harta & David S. Morrisonb
Tea may be a potentially modifiable and highly prevalent risk factor for the most common cancer in men, prostate cancer. However, associations between black tea consumption and prostate cancer in epidemiological studies have been inconsistent, limited to a small number of studies with small numbers of cases and short follow-up periods and without grade-specific information. We conducted a prospective cohort study of 6,016 men who were enrolled in the Collaborative Cohort Study between 1970 and 1973 and followed up to December 31, 2007. We used Cox proportional hazards models to investigate the association between tea consumption and overall as well as grade-specific risk of prostate cancer incidence. Three hundred and eighteen men developed prostate cancer in up to 37 years of follow-up. We found a positive association between consumption of tea and overall risk of prostate cancer incidence (P = 0.02). The association was greatest among men who drank ≥7 cups of tea per day (HR: 1.50, 95% CI: 1.06 to 2.12), compared with the baseline of 0–3 cups/day. However, we did not find any significant association between tea intake and low- (Gleason <7) or high-grade (Gleason 8–10) prostate cancer incidence. Men with higher intake of tea are at greater risk of developing prostate cancer, but there is no association with more aggressive disease. Further research is needed to determine the underlying biological mechanisms for the association.
