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Those who micromanage their diets instead of following Michael Pollan’s sensible rule of thumb—eat food, not too much, mostly pl

admin2016-03-21  31
问题     Those who micromanage their diets instead of following Michael Pollan’s sensible rule of thumb—eat food, not too much, mostly plants—may be thrown into confusion by a paper just published. It describes a meta-analysis of 72 pieces of research involving more than 600,000 people.
    Some of these were of what those people ate, or said they ate. Some were of the levels of various fats circulating in their bloodstreams. Some were of both. All had looked for relations between these facts and a person’s subsequent cardiac health. And the meta-analysis comes to what will, to many, be counterintuitive conclusions.
    Rajiv Chowdhury of Cambridge University and his colleagues found that one puzzle, trans-fats , are indeed associated with heart disease—though they caution that only five of the studies they looked at had relative data on these. Other common beliefs, however, were not supported.
    They found no evidence that eating saturated fats or having high levels of circulating saturated fatty acids had any effect on cardiac disease. Nor did they find that omega-3 fatty acid, the current poster-boys of healthy eating, protect against heart disease.
    Omega-3 fats are widely sold in capsule form as food supplements. This makes them easier than other fats to incorporate into experiments that administer something to one group while denying it to another. Dr. Chowdhury’s meta-analysis was based on such experiments. Indeed two big, new trials of omega-3 supplements are going on at the moment. But such trials are hard to do on other sorts of fat, since these are simply part of people’s diets. Many people do not mind being asked either to pop a capsule regularly, or to refrain from doing so. It is understandably harder to persuade them to let someone else decide their entire food consumption for the several years needed to conduct trials like these.
    This sort of unwillingness is, indeed, one reason heart disease is a problem. Most people do not have the willpower to stick to a diet, any diet, prescribed by someone else—even the simple one offered by Mr. Pollan, who is the author of "Food Rules: An Eater’s Manual". But eating a reasonably mixed ingredient diet, along with moderate exercise, still seems the best route to a long and healthy life. Dr. Chowdhury and his colleagues are not suggesting that the amount of fat you eat has no bearing on your risk of having a heart attack. What their research does suggest is that, trans-fats aside, the type of fat may not matter.
The 72 pieces of research aimed at______.
选项 A、finding out most people’s eating habits
B、looking for genetic factors of cardiac health
C、studying all sorts of fats in the bloodstreams
D、seeking relations among diets, fats and heart health
答案D
解析 根据题干的72 pieces of research定位到第一段，而答案却来自第二段，第二段的some of these，some，all等词都指代上一段的72 pieces of research。第二段第二行的all hadlooked for…一句才是答案，all指代这些研究，而looked for“探寻”=aimed at“目的在于”，故答案是looked for relations between these facts and a person’s subsequent cardiac health，其中these facts指前面提到的what those people ate和fats circulating in their bloodstreams，总结为diet和fats两个词，即选项[D]seeking relations among diets，fats and heart health为答案。其中seek=look for；diets，fats=these facts；heart health=cardiac health。而[A][C]两项过于片面；[B]的genetic factors文章则未曾提到。
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