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
Imagine eating everything delicious you want—with none of the fat. That would be great, wouldn’t it? New "fake fat" products
Imagine eating everything delicious you want—with none of the fat. That would be great, wouldn’t it? New "fake fat" products
admin
2012-02-02
52
问题
Imagine eating everything delicious you want—with none of the fat. That would be great, wouldn’t it?
New "fake fat" products appeared on store shelves in the United States recently, but not everyone is happy about it Makers of the products, which contain a compound called olestra, say food manufacturers can now eliminate fat from certain foods. Critics, however, say the new compound can rob the body of essential vitamins and nutrients (营养物) and can also cause unpleasant side effects in some people. So it’s up to decide whether the new fat-free products taste good enough to keep eating.
Chemists discovered olestra in the late 1960s, when they were searching for a fat that could be digested by infants more easily. Instead of finding the desired fat, the researchers created a fat that can’t be digested at all.
Normally, special chemicals in the intestines (肠) "grab" molecules of regular fat and break them down so they can be used by the body. A molecule of regular fat is made up of three molecules of substances called fatty acids.
The fatty acids are absorbed by the intestines and bring with them the essential vitamins A, D, E, and K. When fat molecules are present in the intestines with any of those vitamins, the vitamins attach to the molecules and are carried into the bloodstream.
Olestra, which is made from six to eight molecules of fatty acids, is too large for the intestines to absorb. It just slides through the intestines without being broken down. Manufacturers say it’s that ability to slide unchanged through the intestines that makes olestra so valuable as a fat substitute. It provides consumers with the taste of regular fat without any bad effects on the body. But critics say olestra can prevent vitamins A, D, E, and K from being absorbed. It can also prevent the absorption of carotenoids (类胡萝卜素 ), compounds that may reduce the risk of cancer, heart disease, etc.
Manufacturers are adding vitamins A, D, E, and K as well as carotenoids to their products now. Even so, some nutritionists are still concerned that people might eat unlimited amounts of food made with the fat substitute without worrying about how many calories they are consuming. (381 words)
Olestra is different from ordinary fats in that______.
选项
A、it passes through the intestines without being absorbed
B、it facilitates the absorption of vitamins by the body
C、it helps reduce the incidence of heart disease
D、it prevents excessive intake of vitamins
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/xRna777K
本试题收录于:
艺术硕士(艺术基础)题库专业硕士分类
0
艺术硕士(艺术基础)
专业硕士
相关试题推荐
IntheUnitedStates,itisimportanttobeontime,orpunctual,foranappointment,aclass,ameeting,etc.However,thismay
ItcameassomethingofasurprisewhenDiana,PrincessofWales,madeatriptoAngolain1997,tosupporttheRedCross’scamp
Americansarepoundoftheirvarietyandindividuality,yettheyloveandrespectfewthingsmorethanauniform,whetheritis;
Humanityusesalittlelessthanhalfthewateravailableworldwide.Yetoccurrencesofshortagesanddroughts(干旱)arecausing
Accordingtoasurvey,whichwasbasedontheresponsesofover188,000students,today’straditional-agecollegefreshmenare"
Mostepisodesofabsent-mindedness—forgettingwhereyouleftsomethingorwonderingwhyyoujustenteredaroom—arecausedbya
AboutsixyearsagoIwaseatinglunchinarestaurantinNewYorkCitywhenawomanandayoungboysatdownatthenexttable.
TheLastSupperisalate15th—centurymuralpaintingbyLeonardodaVinciintherefectoryoftheConventofSantaMariadell
Americansarepoundoftheirvarietyandindividuality,yettheyloveandrespectfewthingsmorethanauniform,whetheritis;
CarsaccountforhalftheoilconsumedintheU.S.,abouthalftheurbanpollutionandonefourththegreenhouse(温室)gases.The
随机试题
ANewStudyonElephantsArecentstudyofancientandmodernelephantshascomeupwiththeunexpectedconclusionthatthe
诊断肺动脉栓塞最敏感的无创检查方法是()
下列哪项不是六淫致病的特点
判断总流的流动方向用下列哪一判据?()
项目监理机构批准工程延期的基本原则是()。
某高速公路路堤填筑到上路床时,施工人员发现填料粒径偏大,要求填料最大粒径不宜超过()。
外部审计的基本特点是()。
A、B两站之间有一条铁路,甲、乙两列火车分别停在A站和B站,甲火车4分钟走的路程等于乙火车5分钟走的路程,乙火车上午8时整从B站开往A站,开出一段时间后,甲火车从A站出发开往B站,上午9时整两列火车相遇,相遇地点离A、B两站的距离比是15:16,那么,甲火
简述颌面部阻塞性窒息的急救处理。
有如下函数模板:templateTcast(Uu){returnu;}其功能是将U类型数据转换为T类型数据。已知i为int型变量,下列对模板函数cast的调用中正确的是()。
最新回复
(
0
)