Basically any song that reminds you of your eating disorder. The song doesn't have to specifically be about an eating disorder. You can also write down the specific lyrics that make you relate to it.
Personally, mine is The Most Important Part Of Your Body by The Paper Chase.
"Gropin', gangly, unweave at your sleeve, fit your pasty face
And keep banging that fork on that plate, keep spitting down my spiral staircase
Your neckline is all mine, your jaw line, your lifeline has shortened some
And it's all mine, and it's all mine, good God almighty, look what you've done"
"The mind knows what the mouth wants"
"The most important part of your body is the one that currently hurts"