when under stress or consuming caffeine, your adrenal glands continue to pump out adrenaline and cortisol. Your adrenal glands can eventually become damaged in the sense of producing less and less of adrenaline, cortisol and testosterone. This can lead to fatigue, weight gain, mood swings, cravings, insomina, unclear thinking and depression, which can be signs of adrenal burn out.
pwo stimulants, fat burners, coffee, and caffineited drink like pepsi and coke, energy drinks all affect the adrenal glands and as a result cortisol is consistently being produced when u continue to take these products. then it cycles as caffeine was originally believed to be out of the body in 4 hours, it actually can last upto 10 or so hours depending on ur genetic sensitivity to it which will keep u up at night, then u will take more coffee/energy drink/etc the next day and the spiral begins mofo