Introduction: Obesity is a complex multifactorial disorder that combines psychological, social, biological aspects and requires a multidisciplinary approach for proper understanding, diagnosis and treatment. Bariatric surgery, for some pacients, is the most effective tool for obesity treatment and control, however, some pacients doesn’t achieve the desired weight or regain part of the lost weight. Since some change in eating behaviour may negatively influence weight losses, recognizing this condition is essential in order to proceed with an early reintervention and guarantee to the pacient the expected outcome. Purpose: Identify, 18 months after bariatric surgery, the binge eating variation and its relation with weight regain or loss. Materials and methods: Cross-sectional, retrospective study with 108 patients, assisted by an obesity walk-in clinic of a specialized hospital in São Paulo (Brazil), who had undergone bariatric surgery a minimum of 18 months previously. The anthropometric and clinic data were collected from medical records, and binge eating symptoms were evaluated with the application of the Binge Eating Scale (BES). Scale outcomes were related to weight regain and loss at the application moment. Results: The average age (standard error) of the sample was 47 years (±0.91) and 93% were female. Patients had lost 52.2% of their body weight and regained 4.7% of their weight 18 months after the surgery. The elapsed surgical time (> 50 months) was associated with a higher gross weight (p<0.0001). Conclusions: Bariatric surgery has been shown to be effective for improving diabetes mellitus as well as for controlling obesity. The variation in binge eating intensity 18 months after bariatric surgery is a factor that interferes in the amount of weight regained. The presence of binge eating symptoms negatively affects the % total weight loss (%TWL)
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