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
2019-09-30
63
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/K0e4777K
0
考研英语二
相关试题推荐
Homeworkhasneverbeenterriblypopularwithstudentsandevenmanyparents,butinrecentyearsithasbeenparticularlyscorn
HenricIbsen,authoroftheplay"ADoll’sHouse",inwhichapretty,helplesshousewifeabandonsherhusbandandchildrentose
I’m______tothinkthatmostchildrenwouldliketheirteacherstobetheirfriendsratherthantheircommanders.
Somefuturologistshaveassumedthatthevastupsurgeofwomenintheworkforcemayportendarejectionofmarriage.Manywomen,
Somefuturologistshaveassumedthatthevastupsurgeofwomenintheworkforcemayportendarejectionofmarriage.Manywomen,
Somefuturologistshaveassumedthatthevastupsurgeofwomenintheworkforcemayportendarejectionofmarriage.Manywomen,
随机试题
患儿,女,3个月,发热、咳嗽3天,抽搐2次入院。查体:精神反应差,前囟饱满,呼吸节律不整,口周发绀,双下肺满布小水泡音,心音低顿,心率180次/min,肝肋下5cm,右侧巴氏征阳性。哪项治疗是不恰当的
刑事诉讼中强制措施与民事诉讼中强制措施的区别。
WhatisthemostappropriatetitleforthispassageaboutChina’semployment’MinisterZheng’smainpurposeisto______
A.纯化水B.灭菌蒸馏水C.注射用水D.灭菌注射用水E.制药用水经蒸馏所得的无热原水,为配制注射剂用的溶剂
患者,男,患消化性溃疡十余年。饮酒30分钟后出现剧烈上腹部疼痛,诊断为急性胃穿孔,首要护理措施为()。
以刑法外形表现的情况为标准,刑法可以分为哪两种?
在陈某涉嫌交通肇事案中,顾某作为本案的目击证人出庭作证。因为顾某素来与被告人陈某有仇,被告人的家属在法庭上大声抗议,要求顾某回避,在其要求没有得到满足的情况下被告人的家属冲到证人席将顾某殴打一顿。则下列说法哪些选项不符合法律的规定?()
下列金融机构不属于中国银监会统一监督管理的是()
福州船政学堂(北京大学2003年中国近现代史真题)
在VisualBasic32程中,可以作为“启动对象”的程序是______。
最新回复
(
0
)