题目内容：

假设你叫李华，你的美国笔友Sara 给你写信，提到自己偏胖，想节食减肥，征求你的意见。请你给她回一封信，谈谈你对该问题的见解。内容要点如下：

1.健康的重要性

2.学生的任务

3.给sara的合理的健康减肥建议

要求：1.词数100个左右；

2.文章开头已给出，但不计入总词数。

I have received and read your letter, in which you mentioned that you wanted to lose weight by dieting.

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