1．生活水平好了，肥胖的人也越来越多；
2．肥胖会引发多种疾病；
3．合理饮食有利健康。
[写作导航]文章一开始宜用事实说明产生肥胖的客观原因；第二段应从分析主观原因入手，指出人们的一些错误观念以及人们减肥时的极端做法可导致的严重后果及危害；第三段总结全文，指出均衡饮食、加强锻炼才能使人真正健康。
[范文]
with the development of economy and the improvement of living tandard, more and more nutritiou food containing high level of protein, fat and calorie have been introduced to people＇ diet. many people are now enjoying a much better life, which i regarded a luury by their grandparent. children are alway petering their parent to take them to the fat food retaurant uch a mcdonld and kfc. adult, on the other hand, like to have lot of meat and eafood. a a reult, fat people can be een everywhere.
ome people think that being fat mean good health. but thi i not really the cae according to reearch and eperiment done in thi field. in fact being too fat may caue uch fat related dieae a heart attack, hypertenion, etc. eeing that they are getting too fat, ome people go on a diet that＇ too tringent or too lean in order to loe weight. conequently, they uffer from other dieae uch a anemia and malnutrition.WWw.hAOZuowEn.com
obviouly, the food we eat have profound effect on our health. having too much rich food all the time i no good, nor i it much good to have too imple adiet. we houldn＇t go to either etreme. if we want to keep fit, we hould have a balanced diet. remember a well balanced diet plu proper eercie can keep u healthy and energized all the time.