或者这仅仅只是《新英格兰医药杂志》提出的建议。哈佛大 学的Walter Willett和Meir Stampfer指出,理想状况下,所有的维生素补充剂都要经过严格科学的临床实验评估。但这些研究的耗时很长,而且它们带来的问题比它们解决的要多。有 时候,当研究者在努力找出真相时,其意义仅在于潜在的利益要超过其成本。
The best evidence to date concerns folate, one of the B vitamins. Its been proved to limit the number of defects in embryos, and a recent trial found that folate in combination with vitamin B12 and a form of B12 also decreases the re-blockage of arteries after surgical repair.
一个很好的例子是叶酸,它是维生素B的一种。它被证明能限制胎盘缺陷的数量,而且最近的试验发现叶酸和维生素B12及一种形式的B6联合使用时能降低外科手术后动脉的再次阻塞。
The news on vitamin E has been more mixed. Healthy folks who take 400 international units daily for at least two years appear somewhat less likely to develop heart disease. But when doctors give vitamin E to patients who already have he art disease, the vitamin doesnt seem to help. It may turn out that vitamin Eplays a role in prevention but cannot undo serious damage.
关于维生素E的资讯则复杂的多。每天服用400国际单位维生素E至少两年的健康人群,看上去得心脏病的可能性要比常人小。但是医生给已经患心脏病的病人服用维生素E时,却似乎没有任何帮助。这表明维生素E在预防中能起到作用,但无法治疗严重的损伤。
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