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
考研
Parents of children who happily eat what’s put in front of them might assume their kids are well nourished. But two new studies
Parents of children who happily eat what’s put in front of them might assume their kids are well nourished. But two new studies
admin
2015-05-24
83
问题
Parents of children who happily eat what’s put in front of them might assume their kids are well nourished. But two new studies drive home the importance of varying that diet. Deficiencies of vitamin D, omega-3 fats, and other healthful compounds are common; it turns out—and consequential.
Growing evidence links vitamin D deficiency not only to weak bones butalso to impaired immunity, asthma, and diabetes among other problems. And some of the latest research finds that rates of asthma and related respiratory problems climb in kids who are short on other commonly missing essentials, including vitamins C and E and omega-3 fatty acids.
A team at the Harvard School of Public Health evaluated the diet and respiratory (relating to the process of breathing) health of some 2,000 North American high school seniors and found that teens who lack of fruit, vegetables, and other healthful foods were most likely to have problems such as coughing, panting, episodes of bronchitis, and asthma.
Vitamins C and E, which are abundant in fruit and dark-green vegetables, may "protect the lung from stress," says Harvard research fellow and study leader Jane Burns. Omega-3 reduces inflammation, a key feature of asthma, in which airways swell and make breathing difficult. Oily fish like salmon, mackerel, and tuna—as well as cod-liver oil—are rich in both omega-3 and vitamin D.Vitamin D can also be obtained from multivitamin milk and sunshine—and many kids should be getting more of both.
In another new study, researchers found that 55 percent of outwardly healthy children and teenagers they tested didn’t have enough vitamin D to grow healthy bones. Dark-skinned children were particularly likely to be short of the bone-building vitamin, according to Babette Zemel, an author of the study and director of the Nutrition and Growth Laboratory at Children’s Hospital of Philadelphia. The melanin (a natural dark brown colour in human skin, hair, and eyes) that makes their skin dark also blocks ultraviolet rays, which the body uses to make vitamin D.In winter, when the sun was weakest, more than 90 percent of blacks in the study were vitamin D deficient.
Researchers suggest pointing kids outside, and waiting a few minutes before putting on sun block;10 minutes of midday summer sun provides 10,000 international units of the vitamin—more than enough for a day. Like melanin, sunblock prevents the skin from making vitamin D, so a bit of lotion-free exposure is necessary to grab the benefit.
According to the text, dark-skinned kids are particularly short of vitamin D in that the dark skin
选项
A、has more melanin that consumes more vitamin D
B、absorbs more ultraviolet rays, thus killing the melanin.
C、can only produce units of the vitamin when the sun was strong.
D、has more melanin that blocks ultraviolet rays, reducing vitamin D production.
答案
D
解析
事实细节题,考查因果细节。根据题干的dark-skinned kids定位到第五段。该段讲到黑色素同时也阻挡紫外线,而紫外线是人体合成维生素D的来源。故选D项。
转载请注明原文地址:https://kaotiyun.com/show/wj74777K
0
考研英语一
相关试题推荐
Atwork,asinlife,attractivewomengetalotofgoodlucks.Studieshaveshownthattheyaremorelikelytobe【C1】______than
Facebookhasbeen【C1】______withfireandhasgotitsfingersburned,again.OnNovember29thAmerica’sFederalTradeCommission
Facebookhasbeen【C1】______withfireandhasgotitsfingersburned,again.OnNovember29thAmerica’sFederalTradeCommission
NewBookofEconomics—AnimalSpiritsNotwoeconomiccrisesareidentical.Butthesamequestio
CaloriesandHumanHealthDieting,accordingtoanoldjoke,maynotactuallymakeyoulivelonger,butitsurefeelsthatw
"Therearenoshortcutsinevolution,"famedSupremeCourtjusticeLouisBrandeisoncesaid.Hemighthavereconsideredthosew
Thereisnothinglikethejoyoffindingoutthatsomethingsinfulisactuallygoodforyou,whetherit’ssex,chocolateoragl
SupposeCharlesDarwinhadbeensweptoverboardanddrownedduringthevoyageoftheBeagle.Whatwouldtheworldbelikewithou
Youfellillandneededanoperation.ThedoctorsofTallOaksHospitalcarriedoutanoperationonyou.Writeraletterofthan
StephenM.Saland,chairmanoftheStateSenateEducationCommittee,isaconservativeupstateRepublican,andStevenSanders,c
随机试题
摩尔定律表示溶液混合前后,溶液的摩尔数相等,用M1V1=M2V2表示。
某企业为了能够较快掌握先进技术,缩短与先进企业的差距,适宜采取的技术模式有()
试述全面建设小康社会的重大举措。
正常血清总胆红素含量为
记账凭证账务处理程序是最基本的账务处理程序,其特点就是登记账簿的工作量较小。()
对于欧式看跌期权而言,如果标的资产价格上升,期权的价格会()
在个人汽车贷款中,操作风险的防控措施包括()。
下列原则中,不能溯及既往的是()。
评述蔡元培的教育大学教育思想和对北京大学的改革。
当在微波炉中加热时,不含食盐的食物,包括其内部可以达到很高的、足以把所有引起食物中毒的细菌杀死的温度;但是含有食盐的食物的内部则达不到这样高的温度。假设以下提及的微波炉性能都正常,则上述断定可推出以下所有的结论,除了
最新回复
(
0
)