请你以“Ways to keep healthy”为题，根据下面的信息提示写一篇作文（初二水平）

As we all know, people want to keep healthy.But how can we do that?It seems mysterious.So I think we should eat more vegetables and fruits,because they contain a lot of vitamins.We shouldn't eat butter,cheese,chocolate and drink coffee,because they contain a lot of sugar and fat.It can make you become fatter and fatter.In a word,we'd better have a balanced diet.We also need to take exercise everyday and have a good rest,so that we can keep fit at once.
By the way,we shouldn't stay up too late and we'd better not smoke.In this way,I'm sure that we can become very strong.