Final answer:
Gwen's symptoms of eating large amounts of food and then purging suggest she is likely suffering from bulimia nervosa, which includes harmful compensatory behaviors after bingeing.
Step-by-step explanation:
Gwen appears to suffer from bulimia nervosa, which is characterized by recurrent binge eating followed by attempts to purge the excess food through vomiting or using laxatives. Unlike binge eating disorder, which involves bingeing without purging, bulimia nervosa includes compensatory behaviors to prevent weight gain. People with this condition often face serious health complications, including electrolyte imbalances and heart issues, in addition to psychological issues like anxiety and depression.