In HS only the seniors were allowed to eat in class. I recall almost all of us would eat breakfast during our first class and then snack on other stuff during the last class. College was different though. Food/drinks weren't even allowed in the building. It may have been due to the fact that it was a graphic design class and the school didn't want the $3,000 macs to get destroyed, but still they could have at least let us have some bottled water.