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
52
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)
What is the main idea of this passage?
选项
A、Dropping in fat consumption attributes to obesity.
B、A new theory of obesity—a diet affecting brain chemistry.
C、The obesity gene in humans was found half a decade ago.
D、Explosion of obesity can be controlled.
答案
B
解析
从第二段第二句开始介绍导致肥胖原因的新发现,所以我们认为B合适。
转载请注明原文地址:https://kaotiyun.com/show/h59O777K
0
考博英语
相关试题推荐
Inthispart,youarerequiredtowriteacompositionentitledDualityofScience:ItsPositiveEffectsandSideEffectsinnol
ThepoetryofGwendolynBrookshasbeenpraisedfordeepeningthesignificanceofpersonalandsocialexperiencessothatthese
AsIrecallmyplanetriparoundtheworldlastJulyandAugust,Ithinkmydifficultywastheadjustmenttothedifferent_____
Theliberalviewofdemocraticcitizenshipthatdevelopedinthe17thand18thcenturieswasfundamentallydifferentfromthato
Howeverimportantwemayregardschoollifetobe,thereisnogainsayingthefactthatchildrenspendmoretimeathomethanin
(66)GNPbecomesanobsoletemeasureofprogressinasocietystrivingtomeetpeople’sneedsasefficientaspossibleandwitht
Nobodyyetknowshowlongandhowseriouslytheshakinessinthefinancialsystemwill______downtheeconomy.
Idon’tunderstandwhypeople______suchabeautifulgardenwithcansandbottles.
Hetriesto_____himselfwitheveryonebypayingthemcompliments.
Unconsciously,weallcarrywithus【51】havebeencalled"bodybubbles".Thesebubblesarelikeinvisiblewails【52】defineourper
随机试题
Travelershadbettermaketheirreservationswell________iftheyaretoflyduringtheChristmasholidays.
资本主义社会的三大矛盾是什么?
社区发展这一概念由联合国倡导并在世界范围内推广是在【】
电子源、加速电场、撞击阳极靶面是产生X线的基本条件。钨丝通过电流加热至一定温度后,即放出电子,这些电子在灯丝周围形成空间电荷,也称电子云。灯丝放出的电子,要高速冲击阳极,还必须具备2个条件:①在X线管的阴极和阳极间加以高电压,通过在两极间产生的强电场使电
疾病主要累及的靶器官,以非炎症性病理改变为主要特点的风湿病是
甲、乙、丙三人共同抢劫案,一审判决后,甲对一审判决提出上诉后突然死亡,乙也提起了上诉,丙未提出上诉,二审法院开庭审理了此案。请根据本案回答下列问题:二审法院经审理后认为。对乙、丙的量刑均过轻,且应定抢劫罪,则下列选项说法正确的有:()
检验证书的作用不包括()。
甲公司2018年2月1日购入乙上市公司股票支付价款5321万元,其中包括交易费用11万元(不含税),甲公司将其划分为交易性金融资产核算。2018年4月16日乙公司宣告发放现金股利,甲公司可分得60万元,2018年9月20日,甲公司将乙公司股票全部出售,取得
康塔塔《华沙幸存者》的曲作者是()。
2011年春天甲收购站与乙梨园签订预购梨4万公斤的合同。签订合同时,乙方考虑到梨的生长受气候的影响很大,主张在合同中附加“收成达七成以上时才供应4万公斤梨”的条款。甲方对此亦表同意。这种附加条款属于()。
最新回复
(
0
)