Deb gorges on large amounts of food. after a binge, she "compensates" by exercising excessively and making herself vomit. deb appears to be suffering from

Deb appears to be suffering from bulimia nervosa.

Bulimia is a disorder in patients who overeat and then make themselves throw up everything they have previously eaten. This can be done though excessive exercise, using laxatives, water fasting, etc. Bulimia isn't only an eating disorder - it is also a mental one affecting a person's psyche, not only their body.