I know from personal experience how family-based treatment (FBT, also known as the Maudsley approach) can work in treating anorexia. I'm thrilled that the evidence is mounting for its effectiveness with bulimia, too, especially for teens with bulimia.
But don't take it from me! Maudsley Parents has been putting together information on bulimia and its treatment, which you can see here.
Both Stanford University (where Dr. Lock teaches and researchers) and the University of Chicago (where Dr. le Grange is based) are recruiting teens for bulimia studies right now.
Here's a video of Dr. James Lock, who literally wrote the books (along with Daniel le Grange) in the U.S. on FBT, talking about bulimia: