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
职业资格
The first time I questioned the conventional wisdom on the nature of a healthy diet, I was in my salad days, almost 40 years ago
The first time I questioned the conventional wisdom on the nature of a healthy diet, I was in my salad days, almost 40 years ago
admin
2015-03-27
61
问题
The first time I questioned the conventional wisdom on the nature of a healthy diet, I was in my salad days, almost 40 years ago, and the subject was salt. Researchers were claiming that salt supplementation was unnecessary after strenuous exercise, and this advice was being passed on by health reporters. All I knew was that I had played high school football in suburban Maryland, sweating profusely through double sessions in the swamp like 90-degree days of August. Without salt pills, I couldn’t make it through a two-hour practice; I couldn’t walk across the parking lot afterward without cramping.
While sports nutritionists have since come around to recommend that we should indeed replenish salt when we sweat it out in physical activity, the message that we should avoid salt at all other times remains strong. Salt consumption is said to raise blood pressure, cause hypertension and increase the risk of premature death. This is why the Department of Agriculture’s dietary guidelines still consider salt Public Enemy No. 1, coming before fats, sugars and alcohol. It’ s why the director of the Centers for Disease Control and Prevention has suggested that reducing salt consumption is as critical to long-term health as quitting cigarettes.
And yet, this eat-less-salt argument has been surprisingly controversial—and difficult to defend. Not because the food industry opposes it, but because the actual evidence to support it has always been so weak.
When I spent the better part of a year researching the state of the salt science back in 1998— already a quarter century into the eat-less-salt recommendations—journal editors and public health administrators were still remarkably candid in their assessment of how flimsy the evidence was implicating salt as the cause of hypertension.
While, back then, the evidence merely failed to demonstrate that salt was harmful, the evidence from studies published over the past two years actually suggests that restricting how much salt we eat can increase our likelihood of dying prematurely. Put simply, the possibility has been raised that if we were to eat as litde salt as the U.S.D.A. and theC.D.C. recommend, we’d be harming rather than helping ourselves.
Why have we been told that salt is so deadly? Well, the advice has always sounded reasonable. It has what nutritionists like to call "biological plausibility". Eat more salt and your body retains water to maintain a stable concentration of sodium in your blood. This is why eating salty food tends to make us thirsty: we drink more; we retain water. The result can be a temporary increase in blood pressure, which will persist until our kidneys eliminate both salt and water.
The scientific question is whether this temporary phenomenon translates to chronic problems: if we eat too much salt for years, does it raise our blood pressure, cause hypertension, then strokes, and then kill us prematurely? It makes sense, but it’s only a hypothesis. The reason scientists do experiments is to find out if hypotheses are true.
The N.I.H. has spent enormous sums of money on studies to test the hypothesis, and those studies have singularly failed to make the evidence any more conclusive.
With nearly everyone focused on the supposed benefits of salt restriction, little research was done to look at the potential dangers. But four years ago, Italian researchers began publishing the results from a series of clinical trials, all of which reported that, among patients with heart failure, reducing salt consumption increased the risk of death.
What the passage tries to tell the reader is that______.
选项
A、food industry misled people about salt consumption
B、strict salt consumption is necessary for people’s health
C、salt consumption has no direct effect upon people’s health
D、the suggestion of strict salt consumption might be misleading
答案
D
解析
整篇文章的大意是,盐对人的健康的影响其实并未得到证实,因此,严格控制盐的摄入量可能误导了人们对盐的负面作用的认识。
转载请注明原文地址:https://kaotiyun.com/show/iwCv777K
本试题收录于:
英语学科知识与教学能力题库教师资格分类
0
英语学科知识与教学能力
教师资格
相关试题推荐
WhichofthefollowingcannotberegardedasafeatureofsuccessfulEnglishteacher?
Whenateacherintendstointroduceanewgrammaritem,whichofthefollowingstrategiescanbeusedtogetstudentstonotice
TheEurohas______,butthedollarisup.
______helpsstudentsfacilitatetheirprocessofaccumulatingvocabulary,broadeningscopeofvision,andincreasingtargetlang
WhichofthefollowingshouldateacheravoidwhenusinganELTcoursebook?
Whatdothefollowingsentencespractice?PeterandIwenttothecinemayesterday.PeterandIwenttothecinemayesterday.Pe
Lookingbackonmychildhood,Iamconvincedthatnaturalistsarebornandnotmade.Althoughwewerebroughtupinthesameway
DeathValleyisoneofthemostfamousdesertsintheUnitedStates,coveringawideareawithitsalkalisand.Almost20percen
OneoftheexecutivesgatheredattheAspenInstituteforaday-longleadershipworkshopusingtheworksofShakespearewasdi
AsimplepieceofropehangsbetweensomeenvironmentallyfriendlyAmericansandtheirneighbors.Ononesidestandthosewhoha
随机试题
A.手三里B.睛明C.瞳子髂D.曲泽既可直刺、深刺,又可针刺放血的腧穴是
成人慢性牙周炎的基础治疗是
影像增强器的增益中包括
A.医德认识B.医德情感C.医德意志D.医德信念E.医德行为
按现行国家标准规定,设计照度值与照度标准值比较,允许的偏差是哪一项?()
城市道路衔接的原则不包括:
《会计法》所称的内部会计监督的对象是指()。
按《营业税暂行条例实施细则》的规定,企业下列行为中属于兼营应税劳务与货物或非应税劳务的是( )。
()之于精当相当于固若金汤之于()
A、 B、 C、 A在回答由When(时候)开始的提问时,要接由表示时间的词构成的句子。正确答案是(A)“在周末结束之前”。而(B)完全不符合逻辑,至于(C)是因为重复使用building而设的陷阱。
最新回复
(
0
)