Bariatric surgery has shown effective and well-established results in the fight against the obesity pandemic. However, there are still few studies evaluating prognostic factors in the success of surgical treatment for obesity. Recently, studies have described that Attention Deficit Hyperactivity Disorder (ADHD) is directly related to obesity and the greater difficulty in losing weight with clinical treatment. This study aims to begin analyzing the possible negative effects of ADHD on the success of bariatric surgery.