What happens when you don't stop losing weight after reaching your goal?

I'm curious as to what happens when you continue to lose weight even though you don't want to - you're at your goal or below your "healty targeted weight." I see some AMOS members asking about a revision, is that what a revision is?

We greatly appreciate your interest in helping us build our Q&A database. To discourage vandals from posting garbage, however, we require people to register before posting.