研究發(fā)現(xiàn)，平均每天3個小時暴露在陽光下能夠使患上乳腺癌的風(fēng)險大幅度降低高達(dá)50%之多。這項研究表明經(jīng)常接受陽光的照射能夠促進(jìn)皮膚中合成維生素D,，實驗室測試表明維生素D對癌細(xì)胞有著極強(qiáng)的預(yù)防作用。
據(jù)國外媒體報道,，加拿大科學(xué)家在一項研究中比較了3101名乳腺癌受害女性和3471名健康女性志愿者的相關(guān)數(shù)據(jù)信息,。每一名受訪者都被詢問了她們分別在自己十幾歲、二十至三十歲,，四十至五十歲和六十至七十余歲這四個階段時期,，身處戶外活動的時間情況。該項研究結(jié)果已經(jīng)發(fā)表在了《美國流行病學(xué)雜志》(American Journal of Epidemiology)中,。
充足的維生素D幫助男性遠(yuǎn)離心臟病或中風(fēng)
研究顯示,，那些十幾歲時，每周至少有21小時暴露與太陽紫外線中的女性,，相較那些一天照射太陽不足一小時的受訪者,，患上乳腺癌的風(fēng)險要降低29%。四十至五十歲照射太陽時間充足的女性這種風(fēng)險下降了26%,，而超過60歲人的風(fēng)險竟然下降了50%,。
與此同時另一份研究發(fā)現(xiàn)，充足的維生素D還能幫助男性遠(yuǎn)離心臟病或中風(fēng),。來自美國的這項研究,，針對約119,000名成年人進(jìn)行了長達(dá)20年的跟蹤調(diào)查發(fā)現(xiàn)，長期保持600國際單位維生素D攝入的男性要比那些攝入不足100國際單位的男性患上心臟病或中風(fēng)的風(fēng)險降低約16%,，不過這種模式似乎并不適用于女性,。
不過有關(guān)專家也同時警告，這兩種研究都應(yīng)該均衡考慮到長時間暴露在陽光下會提高患上皮膚癌風(fēng)險的因素,。（生物谷Bioon.com）
生物谷推薦原文出處：
American Journal of Epidemiology doi: 10.1093/aje/kwn198
Vitamin D From Dietary Intake and Sunlight Exposure and the Risk of Hormone-Receptor-Defined Breast Cancer
Kristina M. Blackmore, Maia Lesosky, Heidi Barnett, Janet M. Raboud, Reinhold Vieth and Julia A. Knight
Evidence has emerged for a role of vitamin D in the development of breast cancer, and there is some suggestion that its antiproliferative effect is greater in hormone-receptor-positive cells. Few epidemiologic studies have considered the association between vitamin D and hormone-receptor-defined breast cancer, and the results are conflicting. Considering 759 cases and 1,135 controls from a case-control study (Ontario, Canada, 2003–2005), the authors examined the association between vitamin D intake at specific ages and combined estrogen-receptor- (ER) and progesterone-receptor- (PR) defined breast cancer. While increased intake of vitamin D (from the sun and diet) was most consistently associated with a significantly reduced risk of ER+/PR+ tumors (e.g., odds ratio = 0.76, 95% confidence interval: 0.59, 0.97 for use of cod liver oil during adolescence), comparable nonsignificant associations were found for receptor-negative (ER?/PR?) (odds ratio = 0.74, 95% confidence interval: 0.53, 1.04) and mixed (ER+/PR?) (odds ratio = 0.79, 95% confidence interval: 0.51, 1.22) tumors. This study suggests that vitamin D is associated with a reduced risk of breast cancer regardless of ER/PR status of the tumor. Future studies with a larger number of receptor-negative and mixed tumors are required.
