托福阅读材料：吃肉有助于记忆.doc

托福阅读材料:吃肉有助于记忆
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In recent years, some research has suggested that a high-fat diet may be bad for the brain, at least in lab animals. Can exercise protect against such damage? That question may have particular relevance now, with the butter-and cream-laden holidays fast approaching. And it has prompted several new and important studies。
近年来,一些研究表明高脂饮食可能对大脑有害,至少动物实验的情况如此。那么,运动能否帮助我们抵抗这种损害呢?随着节日到来,一大波充斥着黄油和奶酪的食品正在袭来,这个问题有了特殊的重要性,由此也带来了一些新的重要实验。
The most captivating of these, presented last month at the annual meeting of the Society for Neuroscience in New Orleans, began with scientists at the University of Minnesota teaching a group of rats to scamper from one chamber to another when they heard a musical tone, an accepted measure of the animals' ability to learn and the next four months, half of the rats ate normal chow. The others happily consumed a much greasier diet, consisting of at least 40 percent fat. Total calories were the same in both four months, the animals repeated the memory test. Those on a normal diet performed about the same as they had before; their cognitive ability was the same. The high-fat eaters, though, did much , half of the animals in each group were given access to running wheels. Their diets didn't change. So, some of the rats on the high-f