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BBC新闻重点讲解:Omega-3脂肪酸与学习能力的关系(2009-4-21)

发表时间:2009-04-21内容来源:VOA英语学习网
生理学者亚力克斯·理查森提出了一个试探性的假设,她认为缺少omega-3脂肪酸是对人体有害的。Omega-3 HOST: In 2005, Physiologist Alex Richardson set up a detective hypothesis that the low level of omega-3 were detrimental. She devised a clinical trial amongst a group of school children suffering mood and behavioral disorders. She believed they might benefit from food supplements. The trial, the Oxford Durum study would chart that progress. ALEX RICHARDSON: What we did was to take almost 120 children from British primary schools that they range of 5, or 6 up to 11, and we gave them either a fatty acid supplement or a placebo demi-pill. And while we found with in three months there was a significant improvement in the behavior, but also in the reading and the spelling progress, the literacy skills of the children who got the fatty acid supplements. HOST: Were these children just regular normal, healthy children? Or were these kids who have been struggling at school for whatever reason? ALEX RICHARDSON: In fact, they all might try CRIterion for a condition called developmental coordination disorder, dyspepsia as it's sometimes known, it also overlaps very strongly with birth dyspepsia, and a tension-deficit hypo-activity type problems. HOST: Are you saying that after three months on supplement of the two key omega-3 fatty acid, you said the group who were taking them; there were improvements in their abilities, but by how much? ALEX RICHARDSON: Well, their reading progress of those who got the active supplements improved by nine months in a three-month period. In the controlled group, they just made normal progress, their reading improved three month in three months, which is exactly what you expected from these age-norm tests. In spelling, the children who got the supplements made six-month progress in three, so two or three times the normal rate of progress from perfectly healthy normally performing children was what we saw. HOST: This fact, this is because the children weren't having enough omega-3 of these particular types in their diet to starve at all. Did the extra omega-3 they were given, you know, help leave it the effects of different causes on their learning abilities? ALEX RICHARDSON: We won't able in the study that had taken our blood samples to measure omega-3 in blood as has been done with some mental health patients, nor were we able to get a dairy record. We don't yet know that this is what we need to know, what intake is optimal for the brain. HOST: But might it not be the case that nutrients other than the omega-3 are equally important? If scientists don't know the optimal level of this central fatty acid, how could they be so sure that their proof is so CRItical? They can't, but neurophysiologist professor John Stein of Oxford University believes they have good reason to feel confident. JOHN STEIN: You have to start off with a theoretical basis, with the reason that I've got from chart derives from the importance of the fissions in your nerve membranes and it makes very plausible, physiological sense. Now you've got to have that sort of prior evidence in order to really make in worthwhile to go for a trial, in my opinion. I mean, you could just work your way through thousands of things doing trials and cost a fortune and it would be extremely uneconomic.
来自:VOA英语网 文章地址: http://www.tingvoa.com/html/20090421/1775.html
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