One possible version:

Last week，we made a survey about middle school students' health condition.

The survey shows that the general health of middle school students is declining year by year，with more people having the problem of being overweight. One of the reasons could be that they have a heavy load in their study so that they seldom take physical exercise or do labor work like housework. What's more，many of them don't have a balanced diet. To solve the problem，experts advise that we students should not chat on line so often in order to have enough sleep time and we should do sports for at least one hour a day. Besides，we'd better eat more fruits and vegetables and refuse junk foods.

题目分析：本文是篇指导式提纲式书面表达，虽然限定了内容要点，学生最好采取要点1+1的方式把要点确定为5个，即在原因和专家建议两个要点进行合理扩展。人称上调查结果即在现状和原因两方面上采用第三人称，而专家建议部分多采用第一人称；通篇均采用一般现在时态；注意学以致用，以高中阶段熟悉的知识点及恰当的过渡词追求行文的流畅；用复杂多变的句式和一定的高级词汇提升档次；完整、准确、简洁、规范地表述要点，避免逐字逐句翻译。

【亮点说明】高级词汇的运用：decline，overweight等；衔接词：What's more ，Besides等；复杂多变的句式：with的复合结构；To solve the problem，in order to …（不定式表目的）； The survey shows that…(带宾语从句的主从复合句)；One of the reasons could be that…(表语从句)；…so that they seldom take physical exercise…(结果状语从句)；experts advise that we students should not…(“愿、建、命”的虚拟语气)等既学以致用且处处亮点。