That's the most pathetic thing about these gargantuan piles of shit.  Because they weigh so much, it takes an enormous amount of calories just to maintain their weight, meaning it would only take minimal effort to start losing some of that weight.  In other words, they could easily lose weight while still eating many times what a normal person needs.  And yet they not only manage to maintain their weight, but they keep gaining more!  They are disgusting.