I'm not sure about that role any longer. The role used to be to mix things up and I think to a great extent it still is, but the quality of the work of the political cartoon has been succeeded by the wisecrack, the gag cartoon, so that the cartoonist becomes more of the equivalent of the Jay Leno monologues, or David Letterman monologues.
Diets are essentially traning courses in how to feel fat and feel like a failure