The NIMH reports on a recent study released in Archives of General Psychiatry:

About 3 percent of U.S. adolescents are affected by an eating disorder, but most do not receive treatment for their specific eating condition, according to an NIMH-funded study published online ahead of print March 7, 2011, in the Archives of General Psychiatry.

While the data on the success of treatment for an eating disorder in adolescence is unclear, the fact that most of anyone suffering from a major mental disorder isn't getting treatment is quite disturbing. Given the extremely powerful reinforcement contingencies in place for an eating disorder, earlier intervention is needed.