Almost everyone considers going on a diet sometime in his or her life. All, regardless of sex and age, have something in common - losing weight and losing it fast.

    Though their common aim may seem basically good, they probably do not realize that misguided dieting can do more harm than good to their health. Going on too strict a diet can destroy the balance of chemicals in the human body. This happens because when the body is suddenly given much less food than usual, it feels as though it is being attacked and tries hard to protect itself by saving energy. It does this by slowing down metabolism, the process by which the food we eat is converted into energy. As energy is supplied to the body at a slower and slower rate, dieters gradually become so weak that they can do nothing. They soon lose interest in everything going on about them, and their resistance to illness becomes so low that they are easily attacked by one illness after another.

    Most of those who diet know that foods like rice, bread, potatoes, cakes, sweets, fruits and some vegetables contain carbohydrates, and so can make one fat. What they do not realize, however, is that carbohydrates are our bodies' main source of energy, and that these foods also contain components essential for the composition of substances that are needed to keep the body healthy. As a result, they try to avoid eating these foods, and consequently, they become weaker and less healthy. They begin to have difficulty sleeping properly and start to suffer from radical mood changes. In more serious cases, they even begin to show signs of mental illness.

    It is strange enough that most strict diets recommend artificial sweeteners to take the place of sugar and other natural sweeteners. In fact, such artificial sweeteners actually increase one's appetite and lead to one's eating even more than usual.

    Of course, the fact that misguided forms of dieting result in so many problems does not mean that no dieting is safe or all dieting is harmful to the health. Proper dieting can not only help a person lose ugly excess fat, but can also help him or her to keep it off and to lead a more active, happier and healthier life.

    You might ask just what a proper diet is. Well, simply expressed, a proper healthy diet is one that is well-balanced, or, in other words, one that includes enough but not too many of the kinds of foods that provide the body with the nutrients that it needs to function properly. The most important of these nutrients are the macronutrients: proteins, carbohydrates and fats. The body needs fairly large amounts of proteins and carbohydrates for building material and energy. Meat, fish, eggs, milk, cream, and nuts all contain proteins and foods like rice, bread, potatoes, etc. Contain carbohydrates. The body needs fat to keep it from the cold and to provide a protective layer for the organs, but only in small quantities.

    Vitamins and minerals such as iron, calcium, are another group of essential nutrients, though the body does not need as great a quantity of these as it does the macronutrients - proteins, carbohydrates and fats.

    There are two types of vitamins, water-soluble vitamins and fat-soluble vitamins. Water-soluble vitamins like vitamin C and the B-group vitamins do not stay in the body long and so foods containing these vitamins need to be taken rather often. On the other hand, the fat-soluble vitamins, vitamins A, D, E and K stay in the body for long periods of time and so there is no need to take foods containing them so often.

    One way of getting enough nutrients while keeping one's weight down is to take substitutes for foods which contain too much fat. For example, instead of regular milk, one can take skimmed milk, which contains as many proteins and minerals as regular milk but has had the fat removed. In the same way, vegetable oil can be used for cooking instead of animal oil.

    幾乎每一個人在他或她的一生中都有個時候考慮要節食。所有的人
，不分性別和年齡
，都有個共同之處--要減輕體重
，而且要快速減肥。

    jinguantamengongtongdeyuanwanglingrenjiaodehaoxiangjibenshangshihaode，danshitamenyexubingmeiyishidao，yongzhexiewudaodejieshifangfa
，duitamendeshentijiankanglaishuohaidayuli。guoyuyankedijieshihuipohuairenshentineishengwuhuaxuejiegoudepingheng。zhisuoyihuichanshengzhezhongjieguo，shiyinweidangrenshentiturandedaodeshiwubipingshishaolexuduodeshihou，shentijiuhuijiaodehaoxiangshoudaolexiji，yushishentijiuyongjieyuenengyuanzhichudebanfajinliangshefalaibaohuziji。womendeshentitongguojianmanxinchendaixiesududebanfalaibaohuziji，yijijianmanbawomensuochideshiwuzhuanhuachengnengliangdeguocheng。youyuyiyuelaiyuemandesudugeishentigongyingnengyuan

，zhexiejieshiderendeshentijiuzhujianbiandefeichangxuruo
，yizhiruodaoshenmeshidoubunengzuodechengdu。yushizhexiejieshizhehenkuaijiuhuiduitamenzhouweisuofashengdeyiqieshiqingdoushiqulexingqu，jieguotamendeshentiduijibingdedikangnenglijiubiandefeichangdi，yizhiyutamenhenrongyidijiuhuishoudaoyizhongyouyizhongjibingdelianxuxiji。

    絕大多數節食者都知道，像大米
、麵包、土豆、蛋糕、糖果、各種水果和一些蔬菜等各類食品都含有碳水化合物（即澱粉），因yin而er，都dou會hui使shi人ren發fa胖pang。可ke是shi
，他ta們men都dou沒mei意yi識shi到dao碳tan水shui化hua合he物wu是shi我wo們men身shen體ti的de主zhu要yao的de能neng源yuan
，他ta們men都dou沒mei意yi識shi到dao這zhe些xie食shi品pin裏li都dou含han有you使shi我wo們men的de身shen體ti健jian康kang所suo需xu要yao的de一yi些xie物wu質zhi的de基ji本ben成cheng分fen。結jie果guo
，他ta們men盡jin量liang避bi免mian吃chi類lei食shi品pin，因yin而er他ta們men的de身shen體ti就jiu變bian得de越yue來lai越yue虛xu弱ruo
、越來越不健康。他們開始有了不能適當睡眠的難題
、開始產生了思想情緒上的一些根本變化。在一些較嚴重的病例中，病者甚至開始顯露出有精神病的一些征兆。

    shuolaiyezhenqiguai，naxiezuiyangedejieshideshiputuijianyongrenzaodetianweijilaidaitizhetangheqitatianrandetianshipin。shishishang，zheleirenzaodetianweijishizhishangzengdaleyigerendeshiyu，jieguofanershirenbipingshichidegengduo。

    當dang然ran，種zhong種zhong錯cuo誤wu的de節jie食shi方fang法fa導dao致zhi了le很hen多duo問wen題ti
，但dan這zhe些xie事shi實shi並bing不bu意yi味wei著zhe沒mei有you任ren何he一yi種zhong節jie食shi的de方fang法fa是shi安an全quan的de
，也ye不bu意yi味wei著zhe一yi切qie節jie食shi方fang法fa都dou對dui健jian康kang有you害hai。恰qia如ru其qi分fen地di節jie食shi不bu但dan能neng幫bang助zhu一yi個ge人ren去qu掉diao難nan看kan的de多duo餘yu脂zhi肪fang
，而er且qie能neng幫bang助zhu一yi個ge人ren把ba節jie食shi的de成cheng果guo保bao持chi下xia去qu，能neng幫bang助zhu一yi個ge人ren過guo上shang一yi種zhong更geng加jia充chong滿man了le青qing春chun活huo力li的de
、更為愉快的、更為健康的生活。

    nihenkenenghuiwen
，daodishenmeyangdejieshishipucaishiqiaruqifende。o，jiandandijiang，youyiyujiankangdejieshishipu
，jiushigezhongshiwudounenghenhaodijunhengdeshipu。huanjuhuashuo，jiushizhezhongjieshishipuzhongbaokuolezugoudegezhongshipin，dandoubuyaochideguoduo。zhezugoudeshiwuzukeyitigonggeiwomendeshentizaishidangdifahuiqigongnengshisuoxuyaodegeleiyingyangwuzhi。zhexieyingyangwuzhizhongzuizhongyaodejiushirentisuoxude 大量的營養物質：各類蛋白質、碳水化合物、各類脂肪。人的身體需要有相當量的蛋白質和碳水化合物作為各器官的建築材料和人活動的能源。肉
、魚
、蛋

、奶
、奶油和各種堅果裏麵都含有蛋白質，像大米


、麵包

、土豆之類的食品裏都含有碳水化合物。人體為了禦寒需要脂肪，脂肪能為各種器官提供保護層，但僅有少量的脂肪也就足夠了。

    各種維他命（維生素）和鐵、鈣之類的礦物質是另一類的基本營養物質
，盡管人體對這一類營養物質的需要量並不像對大量營養物質--各類蛋白質、碳水化合物、脂肪--的需要量的那麼大。

    有兩種維他命：水溶維他命和脂溶維他命，像維生素C和B族維生素這類水溶維他命不會在身體內停留很久，所以人體要經常吸收含有這些維他命的食物。另一方麵，維他命A、D、E和K這類脂溶維他命卻能在人體裏停留很長一段時間，因而就沒必要經常地去服用含有脂溶性的食品。

    既(ji)要(yao)得(de)到(dao)足(zu)夠(gou)的(de)營(ying)養(yang)又(you)要(yao)減(jian)輕(qing)體(ti)重(zhong)
，辦(ban)法(fa)之(zhi)一(yi)就(jiu)是(shi)服(fu)用(yong)代(dai)和(he)食(shi)品(pin)，去(qu)代(dai)替(ti)那(na)些(xie)脂(zhi)肪(fang)含(han)量(liang)過(guo)高(gao)的(de)食(shi)品(pin)。例(li)如(ru)，不(bu)服(fu)用(yong)全(quan)脂(zhi)奶(nai)
，而(er)服(fu)用(yong)脫(tuo)脂(zhi)奶(nai)，這(zhe)種(zhong)脫(tuo)脂(zhi)奶(nai)裏(li)含(han)有(you)和(he)全(quan)脂(zhi)奶(nai)同(tong)樣(yang)多(duo)的(de)蛋(dan)白(bai)質(zhi)和(he)礦(kuang)物(wu)質(zhi)，隻(zhi)不(bu)過(guo)是(shi)全(quan)脂(zhi)奶(nai)中(zhong)的(de)脂(zhi)肪(fang)已(yi)經(jing)被(bei)除(chu)掉(diao)了(le)。同(tong)樣(yang)
，可(ke)以(yi)用(yong)植(zhi)物(wu)油(you)來(lai)代(dai)替(ti)動(dong)物(wu)油(you)進(jin)行(xing)烹(peng)調(tiao)。