It often seems that some possess superhuman eating powers, allowing them

游客2024-01-23 63

问题       It often seems that some possess superhuman eating powers, allowing them to down an entire pizza while remaining rail-thin. Others only need to think of a slice and gain five pounds. Now one doctor says there’s evidence that genetics could be behind some of these differences. Regardless of how much you eat, your weight may be out of your hands.
   Vann Bennett, a biochemist at Duke University and his team led a new investigation and discovered why this happens. They engineered mice to have several common modifications of the gene found in humans. They observed that mice who had mutations of ankyrin-B took more glucose （葡萄糖） into their fat cells, which in turn made more fat. Typically, the cell membrane （膜） acts as a barrier to prevent glucose from entering these cells; the alteration kept the gate open.
   The change may serve a useful purpose. "Probably this is not always a bad thing," Bennett told Newsweek. "It could help people survive famines in the past. But today we have so much food that it probably is a bad thing." Our modern diets of fast food drive-thru windows and aisles of packaged snacks make the alteration work against us.
   Dieters have long been told to watch their calories and exercise more, but this new finding suggests that a blanket approach doesn’t work for everyone. And the study illustrates a common problem for people: increased weight gain as a function of age. Our metabolism naturally slows with age, making it harder to maintain the weight of our 30-year-old selves when we’re 50. Now add an unruly ankyrin-B gene, and it may seem impossible to stay slim.
   The mice in the study gained more weight when on high-fat diets. Bennett believes this is because once the fat cells received the glucose and start making more fat, they become sensitive to other fat. Despite being studied in mice, the researchers believe further research on this gene, and possibly others, could potentially create a field of customized diets and health plans based on genetics. Bennett envisions such assessments being performed at birth one day. For now, frustrated dieters can take comfort with one saying: It’s not you. it’s your genes. [br] What is the prospect of further research?

选项 A、It may help people to maintain the perfect weight.
B、It may change many new-born babies gene arrangement.
C、It may present human beings with a series of health plans.
D、It may provide more comfort for the frustrated dieters.

答案 C

解析推理判断题。定位句指出,尽管在老鼠身上进行了研究,研究人员认为,对该基因,或许还有其他基因的进一步研究有可能创建一个以遗传学为基础的定制饮食和健康计划的领域。由此可知,人类通过对自身基因突变的了解，可以制订合理的健康计划，故答案为C。

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