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
2015-10-20
75
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 but also 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。
转载请注明原文地址:https://kaotiyun.com/show/DCzZ777K
0
考研英语一
相关试题推荐
【C1】______wehearmuchaboutthe"newfather",themanwho【C2】______anactiveroleintheday-todaycareofhischildren,ther
【C1】______wehearmuchaboutthe"newfather",themanwho【C2】______anactiveroleintheday-todaycareofhischildren,ther
【C1】______wehearmuchaboutthe"newfather",themanwho【C2】______anactiveroleintheday-todaycareofhischildren,ther
Comeon,myfellowwhitefolks,wehavesomethingtoconfess.Outwithit,friends,thebiggestsecretknowntowhitessincethe
EveryyearLesWexner,theownerofVictoria’sSecret,alingerie(女士内衣)retailer,takesamonthofftotraveltheworldlookingf
In2001,asecretmeetingofleadingIsraeliarchaeologistsareshownaremarkableartifact.It’sastonetablet,apparentlyfro
随机试题
主张文章应“明道”“致用”“事信”“言文”的文学家是()
Ittakesalotof______tohostaschoolsportsmeet.
血管紧张素转换酶抑制剂最突出的副作用是
某建筑企业员工在工程施工中受伤,员工近亲属认为应属于工伤,建筑企业不认为是工伤,则应由()对是否属于工伤承担举证责任。
会计部门各种财产物资明细分类账期末余额与财产物资使用、保管部门的有关财产物资明细分类账期末余额进行核对,属于账账核对的内容。()
广西天峨县个体经济快速发展,税收收入呈快速增长态势。截至2007年11月30日,个体经济税收入库1260万元,同比增收273万元,增长27.65%。这说明()。
以下属于人文景观的是()。
下列选项中,属于我国法的正式渊源的有()
A、 B、 C、 D、 B
StressPainsManyinCollegeMoststudentsinU.S.collegesarejustplainstressedout,fromeverydayworriesaboutgrades
最新回复
(
0
)