I feel well placed to poke fun at fat people, I have suffered all my life with something akin to Prader Willi Syndrome (undiagnosed), the more I eat, the hungrier I get. I've controlled it by activity: bodybuilding, canoeing, bush walking, climbing, motox, and so on, usually all on the same day. My wife has always thought I was hyperactive, only recently have I divulged this problem, she always thought I was eating to fuel my hyperactivity, when in fact it was the reverse.
I'm no longer capable of exercising, or doing the things I used to, so now I cut my calorie intake to 1/4 of normal intake every third day. That means, no chocolate, no cake, no biscuits, and very, very small meals for a whole day. Woe is me!
So I look at it this way, if I can control my weight and eating disorders, so can anyone else.