Bariatric Surgery and Guided Self-help for Binge Eating Disorder (BED)

To demonstrate the effectiveness of an easily administered intervention (guided self help) aimed at reducing binge eating in patients undergoing bariatric surgery.

The investigators hypothesize that patients who have guided self help pre-operatively will have reduced episodes of bingeing pre-operatively compared to those having treatment as usual (bariatric surgery), which will be maintained in the post-operative period, and will be associated with improved weight loss and psychological outcomes after surgery.