The Itchy Jumper
A disordered relationship with food is akin to wearing an itchy jumper. A cheap, itchy jumper.
When you first put it on, it keeps you nice and warm. However, it is not made of very good wool, so it starts to itch after a while. Sometimes, you might feel like taking it off, but you know that if you do, you will be cold, so you put up with the itchiness. With time, however, the itchiness gets harder and harder to tolerate.