Students can’t concentrate on their studies when they are hungry. They often tend to keep glancing at the clock. If they are allowed to suck on candy or chew on gum, they might be able to focus more on their work than the time. The worst part is the 5 minutes before lunch. It’s always the last five minutes that seem to go by so slowly. At that point, their eyes never leave the clock. This means, no work gets done.