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The Brown Fat Has Already Helped to Reduce Weight For most people, fat is a burden. It doesn’t really matter where it appear

admin2013-04-03  73
问题                 The Brown Fat Has Already Helped to Reduce Weight
    For most people, fat is a burden. It doesn’t really matter where it appears, we just don’t want it. But it turns out that our bodies also make a unique form of fat tissue that behaves remarkably unlike any other: rather than storing excess energy, this fat actually burns through it. It’s called brown fat and health experts confirm for the first time that healthy adults have stores of this tissue, which researchers hope to study further as a potential new weight-loss treatment.
    Human newborns have been known to have any significant deposits of brown fat, so called because of its abnormally high concentration of dark-colored mitochondria, the engines that sustain cell activity. The primary purpose of brown fat is to regulate body temperature: the mitochondria-packed cells are designed to burn high quantities of sugar, and release that energy as heat—a mechanism that newborns rely on to keep themselves toasty.
    As people age, however, the body becomes better at regulating temperature, so brown-fat stores shrink and white fat starts to emerge. A research team in Sweden has found that healthy adults retain a sizable amount of fat in the front and back of the neck expressing the same proteins as brown fat.
    Identifying the presence of brown fat is one thing, but activating it to burn more sugar is another. Two studies confirmed that brown-fat cells become more active in the cold. But before we consider joining the Polar Bear Club, can brown fat actually cause weight loss? Brown fat may indeed allow a person to burn more calories with the same amount of consumption. On the basis of animal models, researchers calculate that 50g of brown fat could burn about 20 % daily calorie an average person takes in. Leaner people tended to have more brown-fat deposits than overweight individuals. Interestingly, women were twice as likely as men to have active brown fat.
    Still, the findings don’t necessarily mean that activating brown fat leads to a slimmer waist. For one thing, the body is especially good at maintaining balance, which is why a boost in calorie-burning can often make a hunger signal and prompt people to eat more to make up for the loss. And even if drug companies could find a way to activate brown fat safely, that excess activity could throw off other metabolic systems and damage your health.
According to Para.4,we can safely draw the conclusion that______.
选项 A、it is totally impossible to lose weight by activating brown fat
B、our brown fat will be more active if we go to the North Pole
C、brown fat can surely make you thinner than before
D、to keep fit,an average person should eat 50g brown fat
答案B
解析 推理判断题。由题干定位到第四段可知，本段讲的是促进棕色脂肪活性的方法以及其他一些研究结果。[B]“如果去北极的话，体内的棕色脂肪会变得很活跃”，根据本段第二句，研究证实在寒冷的环境里，棕色脂肪细胞会变得更积极，而北极是非常寒冷的环 境，因此该项符合文意，故为答案。[A]“通过刺激棕色脂肪来减肥是完全不可能的”，根据本段第四、五句可知，棕色脂肪确实能够增强脂肪在体内的燃烧，而且前文也提到研究者们想通过这项研究找出新的减肥方法，所以还是有可能的，故排除；[C]“棕色脂肪一定可以使人更瘦”，推断过于绝对而且无依据，故排除；[D]“每天应吃50克棕色脂肪来保健”与第五句不符，排除。
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