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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  91
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.
Which of the following statements is true according to Para. 1?
选项 A、All people don’t like fat at all.
B、Fat is a kind of tissue storing excess energy.
C、It is once believed that adults hadn’t brown fat.
D、Brown fat can provide a new way to lose weight.
答案C
解析 推理判断题。由第一段可知，大多数人都不喜欢脂肪，把它看成是一种负担。但是最近有研究发现有一种特别的脂肪却有着燃烧脂肪的作用。专家们首次确认成年人身上也有这种棕色脂肪，这与以前的看法截然不同。所以研究者们希望能从中找到减肥新方法。故[C]“人们曾经认为成年人体内不含棕色脂肪”符合文意，故为答案。[A]“所有人都不喜欢脂肪”，文中说大多数人不喜欢，而不是全部，与文章意思不符，故排除；[B]“脂肪是用来储存多余能量的组织”，根据文意，棕色脂肪就不是这样的组织，故排除，[D]“棕色脂肪能够为人们提供减肥新方法”，本段只是说有这种可能性，并不是一定可以，故排除。
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