I can understand always being thin or always being fat and not knowing how the other half lives.  What I can't understand is fit to fat, or fat to fit to fat.  At that point you understand how it feels to be each and the overly obvious benefits to being fit, then somehow still think it's the rest of the world's fault for being lazy and over eating.  At this point it has to be mental illness (coming from my bipolar self) that makes food more rewarding than anything else.  Even over takes basic human dignity and respect from others.