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
外语
Nutrients are the parts of food that are important for life and health. Nutrients are important for three reasons. First, some n
Nutrients are the parts of food that are important for life and health. Nutrients are important for three reasons. First, some n
admin
2013-01-10
27
问题
Nutrients are the parts of food that are important for life and health. Nutrients are important for three reasons. First, some nutrients provide fuel for energy. Second, some nutrients build and repair body tissues. Third, some nutrients help control different processes of the body like the absorption of minerals and the clotting of blood. Scientists think there are 40 to 50 nutrients. These nutrients are divided into five general groups: carbohydrates, fats, proteins, minerals, and vitamins.
The first group of nutrients is carbohydrates. There are two kinds of carbohydrates: starches and sugars. Bread, potatoes, and rice are starches. They have many carbohydrates. Candy, soft drinks, jelly, and other foods with sugar also have carbohydrates. Carbohydrates are important because they provide the body with heat and energy. Sugar, for instance, is 100 percent energy. It has no other food value. Sugar does not build body tissues or control body processes. If there are too many carbohydrates in the body, they are stored as body fat. The body stores fuel as fat.
There are two types of fats: animal and vegetable. Butter, cream, and the fat in bacon are animal fats. Olive oil, corn oil, and peanut oil are vegetable fats. The body has fat under the skin and around some of the organs inside. The average adult has 10 to 11 kilograms (20 to 25 pounds) of body fat. If adults eat too many carbohydrate and fats, they can add another 45 kilograms (100 pounds) to their bodies. Fat is extra fuel. When the body needs energy, it changes the fat into carbohydrates. The carbohydrates are used for energy. Fat also keeps the body warm.
The third group of nutrients is proteins. The word "protein" comes from a Greek word that means "of first importance". Proteins are "of first importance" because they are necessary for life. Proteins are made of amino acids, which build and repair body tissue. They are an important part of all the muscles, organs, skin, and hair. The body has 22 different amino acids. Nutritionists call eight of these amino acids essential because the body does not manufacture them.
There are two kinds of proteins: complete proteins and incomplete proteins. Complete proteins, which the body needs for growth, have all the essential amino acids. Meat, fish, poultry, eggs, milk, and cheese have complete proteins. The body needs complete proteins every day. Incomplete proteins do not have all the essential amino acids. The proteins in vegetables and grains, for instance, are incomplete proteins. Two ways to form complete proteins from incomplete proteins are: (1) to mix vegetables and grains correctly, or (2) to add a small amount of meat or milk to a large amount of grains. The body can then use the complete proteins which result from the mixtures.
Extra protein in the body can be changed to fat and stored as body fat. It can also be changed to carbohydrates and used for energy. If people do not eat enough carbohydrates and fats for the energy that they need, their body uses proteins for energy. Then the body does not have the proteins that it needs to build and repair tissues. A nutritious diet includes carbohydrates and fats for energy, and proteins for growth.
One important source of fat is______.
选项
A、oil
B、grains
C、sugar
D、olive
答案
A
解析
从第三段“Olive oil…are fats”可知,oil是fat的来源之一,故选A项。
转载请注明原文地址:https://kaotiyun.com/show/7ZTO777K
0
研究生英语学位课统考(GET)
相关试题推荐
Anygovernmentthatrefusestomeettheneedsofitspeoplemustbepreparedtoacceptthe______.
Anumberofresearchershaveexaminedthevariables/strategiesthataffectstudents’learningEnglishasasecondlanguage.This
MostpeoplewhodevelopedLymedisease,atick-borninfectionthat’sendemicinpartsoftheNortheastandMidwest,areeasilyc
【T1】Becauseanalysisultimatelyrestswiththethinkingandchoicesoftheresearcher,qualitativestudiesingeneralarelimite
Planningisaveryimportantactivityinourlivesyetreallysophisticated.Itcangivepleasure,evenexcitement,【C1】______ca
Ourlivesarewoventogether.AsmuchasIenjoymyown【C1】______,InolongerimagineIcangetthroughasingledaycompletely
Ourlivesarewoventogether.AsmuchasIenjoymyown【C1】______,InolongerimagineIcangetthroughasingledaycompletely
Ourlivesarewoventogether.AsmuchasIenjoymyown【C1】______,InolongerimagineIcangetthroughasingledaycompletely
Toomuchalcoholdullsyoursenses,butastudyinJapanshowsthatmoderatedrinkershaveahigherIQthanteetotalers.Res
随机试题
光电编码器作为位置测量反馈的参考脉冲系统中,参考脉冲频率f=1000Hz,光电编码每旋转一周,输出脉冲2000个。已知滚珠丝杠导程P=2mm,试求工作台的移动速度。
儿童会说代词“我”的年龄应为
老年人使用可诱发或加重青光眼的是
A.维生素D400U/d。口服B.维生素D1万U/d,口服C.维生素D2每次80万U,肌内注射,每周一次,共3次D.维生素D,每次30万U,肌内注射,每隔2周1次,共3次E.维生素D10万U/d,口服治疗重度维生素D缺乏性佝偻病激期用
甲女系中学学生,一日因在课堂上回答不出老师的提问,被老师当堂罚站,老师还当众说甲女“没见过像你这么笨的猪头、连’坐台’也不配”。甲女回到家中,写下遗书,说老师羞辱她,她活不下去了,趁家人不备,跳楼自杀身亡。则本案中:()
城市详细规划及开发项目初步设计的地形图比例尺一般选用()。
下列哪项概率分布能提供最大的货币期望值?
自由活动时,幼儿三五成群地在沙坑里玩耍,只有杰杰孤零零地站在旁边,一动不动。对此,老师恰当的做法是()。
“润物细无声”这句话所体现的德育方法是_______。
公安机关要保护国家公共财产和公民个人合法财产的安全。()
最新回复
(
0
)