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
110
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.
According to the passage, when were people recommended to eat less salt?
选项
A、Around the early 1990s.
B、Around the early 1980s.
C、Around the early 1970s.
D、Around the early 1960s.
答案
C
解析
作者在第一段说,他第一次质疑健康饮食的本质—以盐为主题,是在40年前,因此可得出答案为20世纪70年代左右。
转载请注明原文地址:https://kaotiyun.com/show/4wCv777K
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
Whenateacherintendstointroduceanewgrammaritem,whichofthefollowingstrategiescanbeusedtogetstudentstonotice
Todistinguishsounds,studentsareencouragedtopractice______.
ThefirsttimeIquestionedtheconventionalwisdomonthenatureofahealthydiet,Iwasinmysaladdays,almost40yearsago
WhichofthefollowingisNOTasuitablepre-listeningactivity?
Whichofthefollowingisaslipoftongue?
Manyyearsago,IcameacrossabookbyAnthonydeMellocalledAwareness.DeMellowasanIndianJesuitpriestwhosewritingwa
TheBritishMedicalJournalrecentlyfeaturedastrongresponsetowhatwasjudgedaninappropriatelylenientreactionbyamedi
Lookingbackonmychildhood,Iamconvincedthatnaturalistsarebornandnotmade.Althoughwewerebroughtupinthesameway
WhathappenedtoMr.Zhu?Hespokein______voiceintoday’sclassthatIcouldhearalmostnothing.
随机试题
过滤方法有几种?分别适用于什么场合?
A.肝脓肿B.脾肿大C.胃肠胀气D.肺气肘E.胆囊炎肝浊音界扩大见于【】
铁的吸收部位()
犯罪概念的本质特征是()。
某城市商业银行在合并多家城市信用社的基础上设立,其资产质量差,经营队伍弱,长期以来资本充足率、资产流动性、存贷款比例等指标均不能达到监管标准。请根据有关法律规定,回答下列问题。经采取处置措施,该银行仍不能在规定期限内恢复正常经营能力,且资产情况
在城市排水区界限内,应根据()划分排水流域。
从全班60名学生中按学号随机抽取6名学生调查其上网情况。6名学生的上网时间(小时/周)分别是:16、12、5、5、10和18。请根据上述资料从下列备选答案中选出正确答案。可以采用()来反映学生上网时间的差异程度。
法体现了统治阶级中最高领导人的意志。()
在武汉某高校内,种有若干棵樱花树,每棵树之间间隔相同。小丁同学在三月樱花开放的一天以相同的速度走在樱花树下,他从第1棵树走到第31棵树用了15分钟,他继续往前走了一阵。经过几棵树后折回去,当他回到第5棵树时共用了40分钟,则小丁同学在折回前继续往前经过了(
Mr.Smithwasa【B1】______industrialist,buthewasnotsatisfiedwithlife.Hedidn’tsleepwellandhisfooddidnot【B2】______w
最新回复
(
0
)