... Her doctor tells her that this is due to a deficiency of thyroxine and triiodothyronine, hormones that speed up metabolism.
What I do before a big exam is study, get goods amount of sleep, stretch your body, practice any breathing Technics, etc. You shouldn't be stressed out from a test, just study and do things to release the stress and ace that test!
True it cause you to lose weight rather than gain weifht