Dear Lin hua,
I'm glad to get your letter
I hear you are not very well these days
I would like to give you some advises and hope it's useful to you.
When you get up in the morning,you could take some exercises like running.For breakfast you could have more fruits and milk.For lunch you need more healthy food such as vegetables and meat rather than junk food.Remember put on your coat before you go outside.
wish you get better!
yours XXX