Anasophia binges on chocolates, then makes herself vomit so that she won't retain any of the calories she just ingested. When she is not doing this she regularly abuses laxatives in the hope that she will not absorb calories and gain weight. Anasophia has a normal body size, but has a great fear of gaining weight. It would be a good idea for Anasophia to be evaluated to see if she is suffering from _______________.