that chewing gum before taking a test improved performance, but chewing gum throughout the test did not. The possible reason for this result is that chewing gum may warm-up the brain, something gum researchers refer to as ”mastication-induced arousal.” In fact, chewing gum for about 20 minutes is on par with mild exercise in terms of sending more blood to the brain. Continuing to chew after the warm-up period seems to have required too much jaw-work, and burning more energy negated the benefits