首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The discovery of the obesity gene in humans half a decade ago offered evidence that chronic weight gain is the consequence of a
The discovery of the obesity gene in humans half a decade ago offered evidence that chronic weight gain is the consequence of a
admin
2013-01-12
65
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)
Which is NOT the newest discovery?
选项
A、Dietary fat turns to body fat more efficiently than does protein or carbohydrate.
B、Disordered brain chemistry due to high levels of fat can not prevent us from eating.
C、Diet rich in fat and fructose hampers the regulation of the hormones concerned.
D、Fat and sugar are addictive like drugs.
答案
A
解析
参考第二段第一句:含脂肪的食物比蛋白质和碳水化合物更容易转化成为身体的脂肪,这是人们早已知晓的道理,故选A。
转载请注明原文地址:https://kaotiyun.com/show/m59O777K
0
考博英语
相关试题推荐
Inthissectionyouarcrequiredtowriteanessayinaccordancewiththefollowingrequirements:A.Title:WesternDevelopm
BecausetimeinIndiaisconceivedstaticallyratherthandynamically,Indianlanguagesemphasizenounsratherthanverbs,since
Thesourcesofanti-Christianfeelingweremanyandcomplex.Onthemoreintangibleside,therewasageneralpiqueagainstthe
Researcherswhorefusetosharedatawithothersmay【31】otherstowithholdresultsfromthem,【32】astudybyhealth-policyanalys
HowtoGetPreservedasaFossil56.Unfortunatelythechangesofanyanimalbecomeafossilarenotverygreat,and57.the
Individualsmayatvariouspointsintheirlivesexperiencediscriminationintheallocationofresourceseither______ofbeing
Asamother,sheistoo______towardsherdaughter,sheshouldletherseemoreoftheworld.
Althoughpunctualhimself,theprofessorwasquiteused______ateforhislecture.
Everylivingthinghasaninnerbiologicalclockthatcontrolsbehavior.Theclockworksallthetimeevenwhentherearenoout
Tosurviveintheintensetradecompetitionbetweencountries,wemust________thequalitiesandvarietiesofproductswemaketo
随机试题
不是肾性蛋白尿的有
盐酸异丙嗪又称为
口腔专科病史不包括
某股份公司于2014年9月30日开出面值45万元、6个月到期的应付票据,票面利率5%,该应付票据2014年12月31日的账面价值为()元。
语调是“情感的晴雨表”,在表达情感方面异常重要。()
_____,sheisthesortofwomantospreadsunshinetopeoplethroughhersmile.
针对当时建筑施工中工伤事故频发的严峻形势,国家有关部门颁布了《建筑业安全生产实施细则》(以下简称《细则》)。但是,在《细则》颁布实施两年间,覆盖全国的统计显示,在建筑施工中伤亡职工的数量每年仍有增加。这说明,《细则》并没有得到有效的实施。以下哪项如果为真,
下列各项中,应当缴纳城镇土地使用税的有()。
[A]excessively[I]degradation[B]collectively[J]neutralize[C]positive[K]pervasive[D]automate[L]additive[E]adop
Therocketengine,withitssteadyroarlikethatofawaterfallorathunderstorm,isanimpressivesymbolofthenewspaceage
最新回复
(
0
)