假如你是Martin，你的笔友Alice在给你的来信中说她经常生病，情绪低落。请你给她写封回信，告诉她应该怎样做。

参考词汇: healthy food, do more exercise, enough sleep, keep happy, talk about your problems.

要求: 1）根据参考词汇，并适当发挥；2）字数不少于70词，注意字迹工整。

Dear Alice,

I'm sorry to hear that you are not very well and feel unhappy.