DearJenny,

　　Hownicetohearfromyou!Inyourletteryouaskedmehowtokeephealthy.Iwouldliketogiveyou

　　someadvice.

　　Asyouknow,weteenagersgrowveryfast,soweneedplentyofnutritiousfoods,suchasfish,beans,

　　especiallyfreshvegetablesandfruits.You'dbetternoteattoomuchmeatorsweet.Also,youshouldtake

　　physicalexerciseregularlyinsteadofstudyingintheclassroomallthetime.Forexample,youcanplay

　　basketballorswimafterschool.What'smore,havingenoughsleepisveryimportant.SoIadviseyouto

　　haveatleasteighthoursofsleepeverydayandnottostayuptoolate.Onlyinthiswaycanyoukeepfit.

　　Yours,

　　LiHua

　　希望能帮到你。

　　一起学习，共同进步，最后记得‘’好评‘’和‘’采纳‘’！