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  3. Americans still have been gaining weight, although they have cut their average fat intake from 36 to 34 percent of their total d

Americans still have been gaining weight, although they have cut their average fat intake from 36 to 34 percent of their total d

admin2011-05-17  73
问题     Americans still have been gaining weight, although they have cut their average fat intake from 36 to 34 percent of their total diets in the past 15 years. Indeed, cutting fat to control or lose weight makes sense. Fat has nine calories per gram. Protein and carbohydrates(碳水化合物) which break down into amino acids and simple sugars respectively, have just four. Moreover, the body uses fewer calories to metabolize(新陈代谢) fat than it does to metabolize other foods.
    But cutting fat from your diet doesn’t necessarily mean your body won’t store fat. For example, between nonfat and regular cookies, there’s trivial difference in calories because manufacturers make up for the loss of fat by adding sugar. Low-fat crackers, soups and dressings can also be just as high in calories as richer versions. No matter where the calories come from, overeating will still cause weight gain. The calories from fat just do it a little quicker. A Wisconsin computer programmer who decided with a diet coach to eat only 40 grams of fat a day learned the lesson firsthand. He wasn’t losing weight. Then he showed his food diary to his coach and revealed he’d been eating half a pound of jelly beans a day. "They don’t have any fat, " he explains. But they had enough sugar to keep him from losing an ounce.
    Nonfat foods become add-on foods. When we add them to our diet, we actually increase the number of calories we eat per day and gain weight. That was born out in a Pennsylvania State University study. For breakfast, Prof. Barbara Rolls gave two groups of women yogurt that contained exactly the same amount of calories. One group’s yogurt label said "high fat" — the other, "low fat". The "low fat" yogurt group ate significantly more calories later in the day than the other group. "People think they’ve saved fat and can indulge themselves later in the day with no adverse consequences , " says Richard Mattes, a nutrition researcher at Purdue University. " But when they do that, they don’t compensate very precisely, and they often end up overdoing it. "
From Professor Barbara’s experiment, we can learn that______.
选项 A、people increase the number of calories they eat per day and gain weight
B、the "low fat" yogurt group ate less calories later than the other group
C、two groups ate the same amount of yogurt
D、people who eat low fat yogurt will not gain weight
答案A
解析 本题是推断题。根据第三段中芭芭拉教授的实验, 我们得知食用低脂酸奶的那一组体重增加反而高于食用高脂酸奶的那组, 因为食用低脂酸奶的人认为自己摄入了较少的脂肪因此在接下来剩下的一天中就会吃很多别的东西往往过了头导致体重增加。根据第三段可知两个group的女性所吃的酸奶卡路里相同that contained exactly the same amount of calories, 并非哪个热量多哪个少, 也并非说吃了同等数量的酸奶, 因此选项B和C都不对。实验结果表明食用低脂酸奶的人反而体重增加, 因此D选项不对。本题只能选A。
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