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
33
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] 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://tihaiku.com/zcyy/4054876.html
相关试题推荐
Thediscoveryoftheobesitygeneinhumanshalfadecadeagoofferedeviden
Thediscoveryoftheobesitygeneinhumanshalfadecadeagoofferedeviden
Amonghumans,theeffectsofagingvaryfromoneindividualtoanother.Theaver
Cloningshakesusalltoourverysouls.Forhumanstoconsiderthecloningo
Cloningshakesusalltoourverysouls.Forhumanstoconsiderthecloningo
FordecadesmanyU.S.veteranswhotookpartinatmosphericnucleartestsha
FordecadesmanyU.S.veteranswhotookpartinatmosphericnucleartestsha
Theinfluenceofthemoralstandardsofthehomeisevident.Ifthereisno
Theinfluenceofthemoralstandardsofthehomeisevident.Ifthereisno
Theinfluenceofthemoralstandardsofthehomeisevident.Ifthereisno
随机试题
What’sthefirststeptogettingajobinterview?Gettingpasttherecruiter
【B1】[br]【B3】[audioFiles]audio_eufm_j71_007(20082)[/audioFiles]massive
[originaltext]W:Insciencefictionmovies,therearemanyexamplesofspaceshi
9度区的A级高度钢筋混凝土高层建筑,其平面局部突出部分的尺寸一般应小于总宽度的3
检查井井框与路面高差值过大(标准为5mm)形成行驶冲击荷载,致使路基下沉造成检查
资产评估方法主要包括( )。A.收益法 B.市场法 C.成本法 D.收入法
尽管借款人目前有能力偿还贷款本息,但存在一些可能对偿还产生不利影响的因素。此类贷
关于热休克蛋白的叙述,哪一项是错误的A.进化过程中所获得的一类蛋白质 B.主要
A.不同频率的振动均可引起基底膜的行波传播 B.振动频率越低,最大行波振幅越靠
咨询工程师在工程项目招标投标管理中的工作主要包括() A.负责组建评标委员会
最新回复
(
0
)