Although bariatric surgery is an effective intervention for severe obesity, a subset of patients demonstrates suboptimal weight outcomes. Postoperative loss of control eating (LOCE) and binge eating may influence weight outcomes, though research has not examined differences by surgical procedure, or factors that predict postoperative LOCE. This study aimed to [1] characterize LOCE and binge eating disorder (BED) over a 7-year period following bariatric surgery; [2] examine concurrent, prospective, and cumulative relationships between LOCE and weight loss; [3] assess whether these associations are moderated by surgery type; and [4] evaluate predictors of LOCE.