The Ca-GBBB strongly focuses on enhancing participant's motivation and belief in their ability to change. The intervention will be comprised of 16-week training program delivered over four months. Sessions will be delivered weekly and each session will last about 45-50 minutes. All sessions will be delivered by master level psychologist. The manual will be translated to Urdu giving special consideration to cultural adaptation of phrases and concepts to reflect Pakistani culture. Additionally, culturally appropriate case scenarios will be incorporated and a consensual view to addressing cultural factors such as gender role, financial difficulties will be taken into consideration. The time and venue of session will be decided prior according to participant convenience.

Treatment as Usual (TAU) group will receive routine care and their follow up will be done at 4-month post-randomization.

The Ca-GBBB strongly focuses on enhancing participant's motivation and belief in their ability to change. The intervention will be comprised of 16-week training program delivered over four months.

The parameters feasibility of undertaking the trial of intervention will include the recruitment rate (the number of patients referred/approached, proportion of those who consented out of all the eligible patients with BED and/or BN disorder referred from and approached at the recruitment sites) (The success criterion of feasibility will be to recruit > 50% of eligible participants) and the attrition rate (the number of patients withdrawn out of those who consented to participate).

Feasibility of the intervention delivery: Duration of each session and completed feedback forms. This will be assessed by keeping record of whether the Ca-GBBB is delivered, received and enacted as intended.

Therapy logs will include each participant's attendance in a session. This will give information about acceptability of intervention. mean attendance rate of >70% i.e. at least 11 sessions, will indicate that the intervention is acceptable for the participants

Tolerability of the intervention is defined as the ability to endure the intervention. Items on Client Satisfaction Questionnaire are scored on a four-point Likert scale from 1 (low satisfaction) to 4 (high satisfaction), with different descriptors for each response point. Totals range from 8 to 32; with higher scores indicating greater satisfaction.

The BITE is a 33-item self-rating scale (Henderson and Freeman 1987). It consists of two subscales: The Symptom Scale (30 items), which measures the degree of symptoms and the Severity Scale (3 items), which provides an index of the severity as defined by the frequency of binge-eating and purging behavior. The total score for all the questions gives a "symptom score" - a score of 15 or above indicate that the individuals has a lot of thoughts and attitudes consistent with eating disorders. The toral score of question 6, 7 and 27 will give a severity index - a score of 5 or above signifies an eating disorder