均衡膳食(having a well balanced diet)
1．生活水平好了，肥胖的人也越來越多；
2．肥胖會引發多種疾病；
3．合理飲食有利健康。
[寫作導航]文章一開始宜用事實說明產生肥胖的客觀原因；第二段應從分析主觀原因入手，指出人們的一些錯誤觀念以及人們減肥時的極端做法可導致的嚴重後果及危害；第三段總結全文，指出均衡飲食、加強鍛鍊才能使人真正健康。
[範文]
with the development of economy and the improvement of living standards, more and more nutritious foods containing high levels of protein, fat and calories have been introduced to people's diet. many people are now enjoying a much better life, which is regarded as luxury by their grandparents. children are always pestering their parents to take them to the fast food restaurants such as mcdonlds and kfc. adults, on the other hand, like to have lots of meat and seafood. as a result, fat people can be seen everywhere.
some people think that being fat means good health. but this is not really the case according to research and experiments done in this field. in fact being too fat may cause such fat related diseases as heart attack, hypertension, etc. seeing that they are getting too fat, some people go on a diet that's too stringent or too lean in order to lose weight. consequently, they suffer from other diseases such as anemia and malnutrition.
obviously, the foods we eat have profound effects on our health. having too much rich food all the time is no good, nor is it much good to have too simple adiet. we shouldn't go to either extremes. if we want to keep fit, we should have a balanced diet. remember a well balanced diet plus proper exercises can keep us healthy and energized all the time.