What is compulsive overeating?

Bulimia is an eating disorder that entails eating large quantities of food, or at least more than usual, and inducing vomiting, to avert weight gain. Doing this often could have lasting effects on the esophagus.

Where as, obesity it having excessive weight, this is a stage beyond overweight, and is equally as unhealthy as being bulimic.

The association with obesity and bulimia is that one prevents the other from happening. But both are unhealthy.