J Alzheimer’s Dis:适量而非过多或过少饮用咖啡可预防阿尔茨海默症的发生

2015-07-30 sunshine 译 MedSci原创

既往研究表明咖啡可能会降低轻度认知障碍的发病风险,但是最新研究表明,这种保护习惯可能依赖于饮用咖啡的习惯如何随时间而变化的。该研究成果发表于《阿尔兹海默症》,研究共纳入了1445名参加意大利老年化纵向研究(ILSA)的研究对象,年龄在65-84岁。Dr. Vincenzo Solfrizzi,该研究的共同作者,及其同事对所有研究对象进行了平均3.5年的随访研究,监测其饮用咖啡的习惯及轻度认知障碍(


既往研究表明咖啡可能会降低轻度认知障碍的发病风险,但是最新研究表明,这种保护习惯可能依赖于饮用咖啡的习惯如何随时间而变化的。该研究成果发表于《阿尔兹海默症》,研究共纳入了1445名参加意大利老年化纵向研究(ILSA)的研究对象,年龄在65-84岁。

Dr. Vincenzo Solfrizzi,该研究的共同作者,及其同事对所有研究对象进行了平均3.5年的随访研究,监测其饮用咖啡的习惯及轻度认知障碍(MCI)的发病率。

研究结果显示,研究期间增加咖啡消耗量至每天一杯以上者发生MCI的可能为减少咖啡消耗量至每天一杯以下者的二倍。

咖啡消耗量随时间而增加至1.5倍的研究对象发生MCI的风险较咖啡消耗量稳定(每天一杯咖啡)者高。然而,咖啡消耗量程度中等(每天一或两杯)较从不或很少饮用咖啡者发生MCI的风险要低。咖啡消耗量一直很高(每天两杯以上)的人员与从不或很少饮用咖啡的人员相比,并未发现咖啡消耗与MCI发病率之间存在明显的关联。

对于其研究发现,研究人员表示:

“这些研究发现表明,从不或很少饮用咖啡以及那些随时间而增加了咖啡消耗量的的认知正常的老年人发生MCI的风险较高。”

因此,中度且有规律的饮用咖啡可能有助于保护神经,防止MCI的发生,证实了既往研究认为咖啡,茶或咖啡因摄入及血浆咖啡因的水平可防止认知功能减退及老年痴呆的发生。

虽然摄入适量的咖啡可保护神经的确切机制尚未清楚,但是 Dr. Solfrizzi及其同事对此已有一些解释理论。

例如,他们假设,咖啡及咖啡因中存在一种主要的化合物可能会降低激活腺苷A2A受体(A2ARs)的活性,减小β淀粉样蛋白(阿尔茨海默症患者大脑中的一个蛋白质片段,可影响神经细胞间的通讯功能)的破坏作用。

研究人员指出,动物研究表明,适量的咖啡因可减少某些A2ARs的活性,这同样可解释本研究中为何从不或很少饮用咖啡或饮用咖啡量较大的人员其发生MCI风险较高的原因。仍需进一步的研究以确定咖啡对抗MCI发生的机制。

“应进行样本量更大,随访时间更久的研究,以解决其他潜在的偏倚及混杂因素,因此希望可以开辟出与饮食相关预防痴呆症和阿尔茨海默症发生的方法,”研究人员总结道。

原始出处:

Coffee drinking habits may influence risk of mild cognitive impairment.MNT.July 29,2015


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    2015-07-30 lovetcm

    研究越来越精细了,也越来越科学了

    0

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