Modafinil isn't a central nervous system stimulant. It affects the suprachiasmatic nuclei in the hypothalamus to create a state of alertness as opposed to sleepiness. It kept me awake all night when I took it and with no discernable jitters or euphoria. In an indirect fashion, it can probably increase fat burning by promoting wakefulness as opposed to sleep. If you are awake, you are likely to burn more calories than if you are asleep.