Any diet on which you eat fewer calories than you need to get through the day — like an 800-calorie-per-day diet can be dangerous. Diets that don't allow any fat also can be bad for you. Everyone needs a certain amount of fat in their diet — up to 30% of total calories — so no one should eat a pletely fat-free diet.
Don't have diets that restrict （限制）certain food groups, either. A diet that requires you to say no to bread or pasta or allows you to eat only fruit is unhealthy. You won't get the vitamins and minerals you need. And although you may lose weight, you'll probably gain it back as soon as you start eating normally again.
Some people start dieting because they think all the problems in their lives are because of weight. Others have an area of their lives that they can't control, like an alcoholic parent, so they focus on something they can control — their exercise and food intake.
People who diet may get lots of praise from friends and family when they start losing pounds, which makes them feel good. But eventually a person reaches a weight level — and doesn't lose as much weight as before because the body is trying to keep a healthy weight, so they aren't any happier.
Some people may find it hard to control their eating, so they stick with an extreme diet for a little while, but then eat tons of food. Feeling guilty about the binge, they use laxatives（泻药）. Eating too little to maintain a healthy weight or eating only to throw up the calories are both eating disorders, which are harmful to a person's health.
1. Which is not the result of restricting certain food groups?
A. lose weight for a short period B. unhealthy
C. short of nutrition D. hungry
2. The reasons why some people start and keep dieting DON’T include .
A. They think their trouble es from their weight.
B. They have an alcoholic parent.
C. Other people’s praise when they lose some weight.
D. There is something they can’t control except food intake.
3. The underlined phrase in the last paragraph refers to .
A. a fat-free diet B. a special diet
C. eating too much D. eating too little
4. Which of the following statements is true?
A. A person needs about 800 calories each day.
B. A person who doesn’t eat bread is unhealthy.
C. An improper diet may cause eating disorder.
D. Fat takes up the most part of calories inside body.
5. According to the passage, when people want to lose weight, they should .
A. avoid eating some food that can lead to being fat B. control their eating amount and times
C. have a healthy and balanced diet D. throw up some of what they eat 1-5 DBDCC
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(答案→)1-5 DBDCC
解析：1.本题为细节题。根据文中第二段内容可知答案为D项。根据文中内容可知不吃某些种类的食品（是因为这些食物容易导致发胖，所以用其它食品代替）并不会导致饥饿。
2.本题为细节题。文中第三段提到了一些人们开始减肥的原因，第四段又提到当他们减掉某些体重时会得到朋友和家人的赞扬，使他们感觉很好，因此会坚持一段时间。而B项所叙述内容只是用来列举某些人生活中有一些无法控制的事情，并不是他们减肥的原因。
3.本题为词义猜测题。根据本句后面的but then eat tons of food以及最后一句中的Eating too little to maintain a healthy weight可知答案为D项。
4.本题为细节判断题。从文中第一段可知人体每天所需要的能量要多于800卡路里，可知A项错误；再者该段说明脂肪占人体所消耗能量的30%，并没有说明所占数量最大，因此可排除D项；另外根据第二段可知面包只是属于某种类别的食物，因此B项叙述错误；根据最后一段可知正确答案为C项。
5.本题为主旨大意概括题。根据全文内容可知即使减肥，为了身体所需也必须做到健康均衡饮食。因此正确答案为C项。