Dear fellow students,

Dear fellow students,
I'm chairman of students' union.I'm glad to write a letter to every student about something happanning at school .Followings are what I want to tell everyone .
Recently,I found the phenomenon so serious that students eat snacks at school.BECIDES,SOME STUDENTS EVEN SPEND much more money to buy snacks to eat .it's reported that eating snackas is a bad habbit of wasting .and most snacks is unhealthy that makes people fat more easily ,even leads to be ill.
what'more.To my surprise,some students also throw the wrappers casually to everywhere in the school.AS a senior student,we should get into a good habbit having a good diet.in order to keep harlthy,please refuse the snacks.
that's all,thanks.请帮我修改一下其中的语法错误和句子的链接,