Dear Mary,
I'm glad to receive your letter and pleased to help you keep fit.Here are some suggestions on how to keep healthy.
Firstly,you should avoid eating food high in fat, like french fries or cookies. Besides,you should eat a lot of vegetables and fresh fruit which are full of vitamins,instead of meat.
Secondly,taking exercise every day can help you to build a strong body.That is, regular exercise is an important part of keeping me healthy.
By eating properly and exercising regularly, you can keep my body at a proper weight and keep healthy. Only you keep a strong will can you keep healthy.
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