Well....looking in the mirror and seeing their fat bodies probably does make them not feel pretty. They may tell the Internet how pretty they're feeling/looking, but, deep down, they know it's a lie.  Hell, at 5' 6", I got up to 147 lbs and I knew  I looked terrible. A speedy divorce and kicking a certain asshole out of my life resulted in a 23 lbs weight loss. Looking in the mirror became much less disheartening.