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  3. If you have gone on a diet and reached your goal, chances are good that when you stop dieting you will regain all the weight you

If you have gone on a diet and reached your goal, chances are good that when you stop dieting you will regain all the weight you

admin2010-04-30  59
问题     If you have gone on a diet and reached your goal, chances are good that when you stop dieting you will regain all the weight you lose. After several weeks on a low-calorie diet—900 calories or fewer— the body conserves energy by showing the speed at which it burns calories. This slow-down explains in part why your weight loss may cease after a few weeks. When you eventually return to eat a normal amount of food, your body may continue to burn calories at the slower rate, storing the remaining calories as fat. So if you are on a strict diet, your body may need fewer calories to maintain the same weight; losing weight becomes more difficult.
    Doctors know that as you gain weight the fat cells in your body (most of us average 30 billion of them) become enlarged. But there is a limit to how big a fat cell can get, and very fat people develop additional fat cells—something more than 100 billion. It now appears that you can add fat cells at any point during your life, although the number you have is influenced by a combination of your history of dieting and your genetic makeup.
    Fat cells differ distinctly from other cells in that they are made mostly of fat instead of protein and apparently they never go away, even after dieting. Instead, they merely shrink. Dr. Jukes Hirsch of Rckefeller University has examined the body tissue of very fat people who have lost weight, and found that it resembles that of starvation victims. Perhaps, he supposes, it is the billions of undersize, "hungry" cells that drive many formerly fat people off their diets.
    New research reveals that your hungry cells aren’t the only signal senders that tempt you toward the refrigerator. Another culprit may be the hormone insulin. Insulin tums sugar and fat into fuel for the body. In addition, some researchers believe that high levels of insulin are a factor in hunger and appetite—and may drive you to overeat.
    Exercise helps maintain your weight and seems to bring insulin levels down, says Dr. Donald S. Robertson, a medical director. "Any weight -loss program must fail," he said, "unless it incorporates a certain amount of exercise."
The implication of the passage is that______.
选项 A、it is hungry cells that make you stop dieting
B、keeping a diet is not the best method of losing weight
C、overweight is caused by fat cells
D、if you want to lose your weight, you should follow a strict diet
答案B
解析 推理判断题。本文主要讲了为什么许多人通过节食减肥失败的原因。第一段讲道，由于身体自身机能，节食减肥到了一定程度就很难有所发展了；接下来三段具体讲了体内脂肪细胞的工作原理是减肥失败，除此之外，荷尔蒙胰岛素也使人难耐饥饿：最后一段讲到，节食与体育锻炼需结合进行。B项是对上述内容的概括总结，为本题答案。A“是饥饿的细胞使你节食”，是原文概括，不是推断，所以排除； C“肥胖是由脂肪细胞引起的”，也是对文章的概括，不用推断，排除C；D“如果你想减肥你应严格节食”，文中没有这个建议，也排除D。最后一段作者还讲到节食必
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