OMG. I have a severely underactive thyroid and fatties are always saying "Well I'm fat because I think mah thyroid don work, you must have a good metabolizm" and the look on their faces is PRICELESS when I tell them that I've literally been diagnosed with hypothyroidism. Hypothyroidism only accounts for 5-10 lbs of weight gain, the rest is just not having any self-control.