[tmi]

The thing is people who are overweight are overweight because they eat too much . There is generally is an emotion that is attached to food, low self esteem, depressed etc. Smokers have things they attach fags to after eating, with a coffee, etc. Drinking booze is associated with socialising and can also be attached to people's emotions. The trouble with food is part of life and its is a lot harder to control than the latter two things has you have to eat to live, I think overweight people should cure the problem then they can cure the overeating.
As for Frank Skinner didnt he have his own addiction demons, pot and kettle spring to mind.