Going through recovery... I understand relapse a little better.
What would make a toddler want a cupcake more than she already does? Telling her she can't have it.
That right there is recovery.
Telling the girl with the eating disorder she has to eat three meals a day, she has to consume x number of calories, she has to stop harming herself, she has to stop taking laxatives, she has to stop counting the calories of every bite she slips down her throat, she has to stop crying when she looks in the mirror, she has to stop beating herself up when she can't excercize.
What would make her want to do all those things more than if she is told she can't do them?