首页
登录
职称英语
For years the media, food labels, dietitians, and even scientists who should
For years the media, food labels, dietitians, and even scientists who should
游客
2023-09-01
63
管理
问题
For years the media, food labels, dietitians, and even scientists who should know better have bombarded (轰炸) us with advice to load up on antioxidants: compounds found mostly in fruits and vegetables that mop up free radicals, which are highly reactive clusters of atoms that have been fingered as the evil-doers responsible for aging and for illnesses from cancer to heart disease.
Not so fast. First, studies piled up showing that taking antioxidants—even such common and seemingly harmless ones as vitamins C and E—as supplements was not beneficial to health and might even be dangerous. Many of the free radicals that are neutralized by antioxidants perform valuable functions in the body. The most important:fighting toxins (毒素) and fighting cancer. Maybe it’s not such an excellent idea to flood the body with something that neutralizes these warriors of the immune system. Or as British chemist and science writer David Bradley noted in his blog,Reactive Reports,"It’s always struck: me as odd that you would want to absorb extra antioxidants anyway, given that oxidizing agents are at the front-line of immune defense against pathogens (病原体) and cancer cells...Suffice to say that taking antioxidant supplements... may not necessarily be good for your health if you already have health problems, especially cancer or an infection. "
The first hints that the trend was crashing came from the hundreds of studies that have tried to assess the health effects of antioxidant supplements. The results have not been pretty. In 2008 the Cochrane Collaboration, an international organization of scientists who assess medical research, carefully checked 67 studies with nearly 400,000 participants. The goal;to determine whether antioxidant supplements reduce mortality in either healthy people or in people with diseases. Conclusion:" We found no evidence to support antioxidant supplements for primary or secondary prevention, and Vitamin A and E may increase mortality. " In analyses of antioxidant supplements and Lou Gehrig’s disease, Alzheimer’s or mild cognitive impairment, and lung cancer, the Cochrane scientists’ verdict was the same: no. And each analysis had an alarming refrain about increasing overall mortality.
It’s not clear why antioxidants in supplement form might be so dangerous. One idea holds that at high doses they become pro-oxidants,stimulating the harmful DNA- and cell-damaging reactions they’re supposed to prevent. But a more likely explanation is that we are seeing the human version of what scientists are finding in studies of lab animals: antioxidants interfere with immune-system cells that fight infection and cancer. [br] The most important function of some free radicals neutralized by antioxidants is______.
选项
A、loading up on antioxidants
B、fighting toxins and cancer cells
C、protecting pathogens and DNA
D、absorbing antioxidant supplements
答案
B
解析
事实细节题。定位句指出,很多被抗氧化物中和的自由基在人体中有着非常重要的功能,最重要的功能就是用来清除毒素和癌细胞,即有些自由基的最重要功能是清除毒素和癌细胞。因此,B)符合题意,故为本题答案。A)“补充足量抗氧化物”和D)“吸收抗氧化物补充物”明显错误,故排除;C)“保护病原体和DNA”,不符合原文,故排除。
转载请注明原文地址:https://tihaiku.com/zcyy/2976078.html
相关试题推荐
Wehavegottheorder______(房屋在什么时候以什么样的方式拆毁).whenandhowthehouseshouldb
He______(不应该让我们等了那么长时间)fornoreasonatall,whichisquiteimpolite.shouldn’
[audioFiles]audio_eusm_j01_190(20099)[/audioFiles]A、Sheshouldliveinthecoun
[originaltext]Why,youmaywonder,shouldspidersbeourfriends?(26)Beca
[originaltext]Why,youmaywonder,shouldspidersbeourfriends?(26)Beca
[originaltext]Why,youmaywonder,shouldspidersbeourfriends?(26)Beca
Scientistswillhaveto_______________________________(提出增加世界粮食供应量的新方法).comeup
[originaltext]Asisknowntoall,scientistsandphilosophershadstudiedt
[originaltext]Asisknowntoall,scientistsandphilosophershadstudiedt
[originaltext]Asisknowntoall,scientistsandphilosophershadstudiedt
随机试题
Tous,theenvironmentinwhichfishdwelloftenseemscold,darkand【B1】___
[originaltext]Sinceaunionrepresentativevisitedourcompanytoinformus
甲、乙、丙三人都接到东方电气公司的面试通知,他们可以选择地铁、开车、公交车等出行
弹性如何有助于解释为什么禁毒可以减少毒品的供给,但可能增加与毒品相关的犯罪
平行结转分步法下,产成品成本份额的计算方法是()。A.产成品实际产量乘以单位约当
企业转销确实无法支付的应付账款的会计处理,下列各项中正确的是:A、借:应付账款
慢性锰中毒典型的临床表现是A.锥体外系损害表现 B.周围神经炎 C.贫血
沿河路堤河岸冲刷防护工程中,不属于间接防护的是( )。 A、护坝 B、挡
下列建筑或场所内应设置排烟设施的有()。A.某建筑面积为3000m2的多层服装加
依据《民法典》的规定,不均等分割遗产的情形包括()。A.有些继承人在生活上
最新回复
(
0
)