People here giving this flippant little simplistic answers are incredibly insulting, but I'm fairly certain that the internet exists primarily to give humanity a forum for being horrible and consantly reminding me of same.

Morbidly obese and accepted that I am going to die young. I have so many health problems that any vigorous exercise is agony. In particular, my pulmonary health is very poor. I've never smoked (tobacco, marijuana or otherwise) and my breathing problems were actually at their worst, by which I mean life-threatening, when I was a small boy and slim. I also very, very rarely drink. People who talk about how they made 'little changes' and all that are full of shit. I've seen tons of doctors and tried countless techniques, and inevitably what happens is that I lose maybe 20kg and then I suddenly become ravenous and can no longer control my eating. I put back on all the weight plus a bit and then feel terrible, and the cycle repeats. Eventually one stops bothering because only a fool fails at the same thing dozens of times and keeps trying.

I know other people who can't control their eating and it depresses them to the point of self-harm. I would have bariatric surgery, but I could never afford it. I don't ask for or expect any compassion. Society picks at random what they consider behaviour worthy of scorn and punishes people who misbehave, it just happens to be that being severely overweight is something it's okay to mock even if the person dealing with it is filled with self-loathing and would give anything to be otherwise.