This is close to the actual truth.
People who are as fat as in that picture, enjoy eating more than they enjoy feeling healthy.
Those that do say they're trying to lose weight, are doing so out of guilt (from ridicule and konwing they should, but don't want to) and not out of desire, which means their "trying" is doomed to fail.
There's often something else going on mentally with these people, because they know that even if they were to lose weight and feel healthy, it would not stop them from hating themselves.. so why try?
SAD