Neurology:ω-3脂肪酸可能延缓大脑萎缩

2012-01-01 MedSci原创 MedSci原创

12月29日,据《每日科学》报道,12月28日发表于在线版神经病学期刊(Neurology,美国神经病学会医学期刊)上的一项研究,与饮食中数种维生素或ω-3脂肪酸含量不高的人相比,饮食中富含这些营养素的人具有较小的可能性发生与老年性痴呆相关的大脑萎缩。 饮食中富含ω-3脂肪酸和维生素C、D、E和B的人,在精神思维测试中也比饮食中缺乏这些营养素的人获得更高的分数。这些ω-3脂肪酸和维生素D主要存在

12月29日,据《每日科学》报道,12月28日发表于在线版神经病学期刊(Neurology,美国神经病学会医学期刊)上的一项研究,与饮食中数种维生素或ω-3脂肪酸含量不高的人相比,饮食中富含这些营养素的人具有较小的可能性发生与老年性痴呆相关的大脑萎缩。

饮食中富含ω-3脂肪酸和维生素C、D、E和B的人,在精神思维测试中也比饮食中缺乏这些营养素的人获得更高的分数。这些ω-3脂肪酸和维生素D主要存在于鱼里。维生素B和抗氧化剂C和E主要存在于水果和蔬菜中。

在另一项研究中,结果表明,与饮食中反式脂肪酸含量低的人相比,饮食中反式脂肪酸含量高的人有较大的可能性发生与老年性痴呆相关的大脑萎缩及在精神思维测试中获得较低的分数。反式脂肪酸主要存在于油炸和速冻食品、烘焙食品级人造黄油中。

这项研究涉及104人,平均年龄87岁,无记忆或思考障碍。通过血液测试来确定每一位参与者血液中的各种营养素的水平。所有的参与者也同样参加了记忆和思维能力测试。对42位参与者进行了脑部核磁共振扫描来测量他们的脑容量。

总体而言,参与者都有良好的营养状态,但7%的参与者缺乏维生素B12,25%的参与者缺乏维生素D。

研究的作者Gene Bowman,波特兰俄勒冈卫生科学大学公共卫生硕士及美国神经病学会会员,指出,血液中营养物质生物标志物在脑容量和思维记忆得分中解释了显著量的变异数。对于思维和记忆得分,营养素生物标记物解释了17%的变异数。其他因素如年龄、受教育年限及高血压解释了46%的变异数。对于脑容量,营养素生物标记物解释了37%的变异数。

"这些结果需要证实,但很显然,这是非常令人兴奋的,人们通过调整饮食就可能潜在的阻止大脑萎缩并保持大脑的灵活,"Bowman说。

这项研究第一次使用血液中的营养素生物标记物来分析饮食对记忆和思维技能及脑容量的影响。以前的研究每次只着眼于一个或很少几个营养素或者使用问卷调查来评估人们的饮食。但问卷调查依赖于人们对他们饮食的记忆,他们也无法计算有多少营养素被身体吸收,在老人中这很成问题。

该研究得到了国立卫生研究院、国家老龄问题研究所、国家补充和替代医学中心、美国退伍军人事务部及波特兰弗吉尼亚州医学中心的支持。(生物谷bioon.com)

Nutrient biomarker patterns, cognitive function, and MRI measures of brain aging

G.L. Bowman, ND, MPH, L.C. Silbert, MD, MCR, D. Howieson, PhD, H.H. Dodge, PhD, M.G. Traber, PhD, B. Frei, PhD, J.A. Kaye, MD, J. Shannon, PhD, MPH and J.F. Quinn, MD

ABSTRACT Objective: To examine the cross-sectional relationship between nutrient status and psychometric and imaging indices of brain health in dementia-free elders. Methods: Thirty plasma biomarkers of diet were assayed in the Oregon Brain Aging Study cohort (n = 104). Principal component analysis constructed nutrient biomarker patterns (NBPs) and regression models assessed the relationship of these with cognitive and MRI outcomes. Results: Mean age was 87 ± 10 years and 62% of subjects were female. Two NBPs associated with more favorable cognitive and MRI measures: one high in plasma vitamins B (B1, B2, B6, folate, and B12), C, D, and E, and another high in plasma marine ω-3 fatty acids. A third pattern characterized by high trans fat was associated with less favorable cognitive function and less total cerebral brain volume. Depression attenuated the relationship between the marine ω-3 pattern and white matter hyperintensity volume. Conclusion: Distinct nutrient biomarker patterns detected in plasma are interpretable and account for a significant degree of variance in both cognitive function and brain volume. Objective and multivariate approaches to the study of nutrition in brain health warrant further study. These findings should be confirmed in a separate population.

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    2012-02-28 chendoc252
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    2012-02-07 yinhl1978
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