It's clear that his parent are an as*hole, so there's no way they will give him that much of food that will keep him so fat. So it's more of that there's something wrong with his body. Take it with how he still have the will to try to workout, working and life for more than 15 years without throwing his humanity, that means he's not really a loser. Just an unfortunate guy through and through. He's clearly better than all the people who talk sh*t because of why not.
Also, if there's a self-fulfilment story for a disable, will people still make fun of it because it's still just a 'self-fulfilment' story? Now I wonder.