hey, does anyone know anything about these drinks, besides they have way too much caffeine, f'up your heart and nervous system, and are expensive? i tried one a few times about an hour and a half before i went to lunch, and i felt like a human garbage inhaler when i went to lunch. i was eating like a freakin animal! do these energy drinks boost appetite and metabolism? i also felt like i was on speed or something, and like i wanted to rip somebodys head off!