To be fair, I did not say it converted glucose into energy. It does, however, speed up the rate at which you metabolize glucose(ATP, adenosine triphosphate, is not merely a chemical in the brain. It is the most basic unit of cellular energy, produced by mitochondria in all cells). In addition to its neurological effects, it ALSO speeds up the rate at which you burn energy, with the same effect as if you were to press the accelerator on a car.