J Functional Foods:过量饮用绿茶会对健康有害吗?

2015-12-14 chenshuo译 MedSci原创

http://www.medicalnewstoday.com/articles/304011.php

一直以来,绿茶在人们的心里是一种有益健康的饮品。但是,根据最近在功能性食品杂志上最新发表的一项研究报告中,研究人员指出,接触过多的绿茶对果蝇的生殖功能有不良的影响,以及影响到它们后代的发育。


虽然目前尚未清楚这种结论对于人类是否一样适用,但研究小组认为他们的研究结果应该引起人们的警惕,同时在生活中尽量不要大量地饮用绿茶饮品。

众所周知,绿茶是由茶树新叶制成的。因为绿茶是一种不经加工的茶叶,因此它保留了大多数抗氧化剂和多酚,这对人体是非常有益的。

另外,在以前的一些研究中也有表明绿茶能帮助减肥,降低胆固醇预防多种疾病,包括癌症、心脏病和老年痴呆症等。

然而,也有一些动物研究报告提到,过度的饮用绿茶可能会导致体重下降和影响胚胎发育等。
为了证实该研究结果,加利福尼亚大学的药学副教授Mahtab Jafari和他的同事们对果蝇胚胎、果蝇幼虫和果蝇进行了一系列的试验。试验中,不同组别的试验对象暴露于不同剂量的绿茶中,以观察影响效果。

研究小组发现,暴露于10mg绿茶的量会导致果蝇幼虫发育较慢。甚至还会导致后代中数目和大小出现显著的降低。

雌性果蝇暴露于10mg的饮料中则会出现生殖能力下降以及寿命周期缩短17%。

此外,研究小组成员还发现,暴露于10mg的绿茶中会导致果蝇生殖器官形态学异常,如睾丸和卵巢发生萎缩。

虽然在这项研究张没有涉及到绿茶对果蝇影响的生理机制,但研究小组推测,有可能是高剂量绿茶浓度引发过度的细胞凋亡,或程序性细胞死亡,从而产生了试验中的效果。

最后,Mahtab Jafari教授评论说:

“通过我们以及过往的研究成果,我们基本上可以认为饮用少量的绿茶会有益健康,但若饮用过量的绿茶,则可能会产生不良的影响。因此,在生活中,我们饮用绿茶产品一定要注意适量。”

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    2015-12-26 hixiaoluo

    好文章,值得看。

    0

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    2015-12-16 hbwxf
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    2015-12-16 仁医06

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