最近某高中拟开展以“校园拒绝零食”为主题的活动。假如你是该校学生会主席，请你以学生会的名义，参考下面的内容提示，给全校学生写一封倡议书。
内容提示：1）描述吃零食的现象；
2）阐述吃零食的影响；
3）提出合理化的建议。
注意：1）词数80-100，开头已为你写好(不计入总词数)。
2）参考词汇：snacks零食；phenomenon现象。
Dear fellow students,
There is a serious phenomenon in our school.
One possible version：
Dear fellow students,
There is a serious phenomenon in our school. We find many students will crowd in the school store to buy snacks after each class. Some students even eat snacks in class.
Eating snacks is a
