Glucose is the only form of energy that the brain can use to remain alert and active. With this in mind, I remember that test prep courses for the ACT and SAT in high school prescribed that students should take an oral shot of M&Ms to boost brain power during the test. I did that and had a soda afterwards. My brain shut down after 30 minutes. The sugar rushed and wore me out!
Anyhow, the sugar rush according to studies appears to be a myth. The body has many processes in place to control the amount of blood sugar that there is in the body. When my processes kicked in as a response to that sugar, according to the book Your Brain: The Missing Manual, my body expended more energy than it would have normally and resulted in the crash of 1994: the incomplete ACT exam.
When planning that party with a purpose, food selection is indeed important. If the party is 
intended to be short, pass out the candy and hotwire your crowd. Pray that the party ends before you short circuit the crowd’s brain. For events that have the potential to last a few hours, stick to delivering to your crowd complex carbohydrates so that the sugars are processed smoothly over the event or test.
