首页
登录
职称英语
The discovery of the obesity gene in humans half a decade ago offered eviden
The discovery of the obesity gene in humans half a decade ago offered eviden
游客
2025-04-26
38
管理
问题
The discovery of the obesity gene in humans half a decade ago offered evidence that chronic weight gain is the consequence of a mismatch between nature and nurture. Simplistic explanations, such as blaming obesity on a drop in fat consumption, ignore scientific reality.
One well-known reason for this is that dietary fat converts to body fat more efficiently than does protein or carbohydrate, but recently scientists have uncovered what appears to be an equally important factor. Some researchers in universities are investigating the possibility that high levels of fat and fructose(果糖)are mucking up our brain chemistry, and thereby muting the signals that would normally tell us to put down the fork. These signals are produced by peptides(缩氨酸),which are regulated by a number of hormones. Under normal conditions these hormones help maintain a stable body weight by adjusting levels of the peptides that control eating. But a diet loaded with fat and fructose hampers the regulation of these hormones. Complicating matters still further is that the brain loses its ability to respond to these hormones as body fat increases—so the obese are doubly penalized.
Other researchers are finding evidence that constant exposure to fat and sugar can cause some humans to crave them as they do an addictive drug. A Princeton University psychologist recently showed that rats fed a high sugar diet were, when the sugar was removed, thrown into a state of anxiety similar to that seen in withdrawal from morphine or nicotine. Sarah Leibowitz, a neurobiologist, believes that frequent exposure to fatty foods may configure the brain to crave still more fat. She has shown in animal studies that galanin, a brain peptide that simulates eating behavior and decreases energy expenditure, increases when the animal eats a high-fat diet.
There are many factors contributing to the explosion of obesity in the United States, and the world, but the radical changes in the composition of our diet are first among them. While scientific work in this arena is
in its infancy
, it’s already clear that varying the amount of fat and other nutrients in the diet affects brain chemistry by activating certain genes, and this in turn directs our dietary preferences. (365 words) [br] What can NOT be inferred from the whole passage?
选项
A、The obesity gene in humans was discovered five years ago.
B、Unbalance between nature and nurture is one of the causes of obesity.
C、Fat can directs our dietary preferences.
D、We shouldn’t eat any sugar and fat any more in the future.
答案
D
解析
从文章最后一段第一句可以看出,该文讲述的是导致肥胖的原因很多,例如吃肥肉和糖,但作者没有建议永远不沾肥肉和糖。
转载请注明原文地址:https://tihaiku.com/zcyy/4054879.html
相关试题推荐
Eversinceitsdiscovery,Plutohasneverreallyfittedin.Afterthepalean
Eversinceitsdiscovery,Plutohasneverreallyfittedin.Afterthepalean
Eversinceitsdiscovery,Plutohasneverreallyfittedin.Afterthepalean
Thediscoveryoftheobesitygeneinhumanshalfadecadeagoofferedeviden
Amonghumans,theeffectsofagingvaryfromoneindividualtoanother.Theaver
Cloningshakesusalltoourverysouls.Forhumanstoconsiderthecloningo
Cloningshakesusalltoourverysouls.Forhumanstoconsiderthecloningo
Cloningshakesusalltoourverysouls.Forhumanstoconsiderthecloningo
WithoutBob’stestimony,evidenceofbriberyislackingand______inthecasew
FordecadesmanyU.S.veteranswhotookpartinatmosphericnucleartestsha
随机试题
WashingtonD.C.isthecapitalofthenationsituatedonthePotomacRiver.
Whenyouhavecompletedyourcollegeeducation,youwilllookforajobsuit
宣告专利权无效的决定,对在宣告专利权无效前人民法院作出并已执行的专利侵权的判决、
新民主主义革命的总路线和三大经济纲领。
在一栋板式高层住宅一侧,拟平行建一栋5层板式住宅,其侧面间距不宜小于下列何值?(
可扪及颞浅动脉搏动的部位在() A.下颌升支后缘 B.下颌角
气阴两亏所致之恶阻,首选方是A.香砂六君子汤 B.青竹茹汤 C.小半夏加茯苓
一国的宏观经济均衡包括()。 Ⅰ.内部均衡 Ⅱ.产出收入均衡 Ⅲ.外部
恶性组织细胞病临床表现变化多端,缺乏特异性,除做骨髓细胞形态学检查外,还应做以下
心理健康的标准不包括A.智力正常 B.情绪良好 C.人际和谐 D.适应环境
最新回复
(
0
)