Bariatric surgery is the most effective treatment for severe obesity, yet a significant percentage of patients achieve suboptimal results or present long-term weight regain. Given the strong association between poor outcomes and post-surgery psychological factors, it is crucial to implement post-surgical psychological interventions. This randomized controlled trial aims to compare the efficacy of a novel, cost-effective, and timely-personalized treatment delivering strategy (stepped-care) with two different intensities 1) low-intensity intervention delivered by Facebook®, and 2) high-intensity program delivered online. It is also intended to study predictors, outcome moderators/mediators, and the underlying mechanisms of weight regain. Participants' assessment will include measures of pathological eating behavior, psychological impairment, negative urgency, and emotional regulation.
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Change in Body max index
Timeframe: Change from Baseline (before the intervention), to 6-,12-, and 18-months (end of treatment) after baseline, and 6 months after end of treatment. Specific duration of time over which participant is assessed: 24 months.
Change in Disordered eating behaviors
Timeframe: Change from Baseline (before the intervention), to 6-,12-, and 18-months (end of treatment) after baseline, and 6 months after end of treatment. Specific duration of time over which participant is assessed: 24 months.
Change in Grazing behavior
Timeframe: Change from Baseline (before the intervention), to 6-,12-, and 18-months (end of treatment) after baseline, and 6 months after end of treatment. Specific duration of time over which participant is assessed: 24 months.
Change in Eating disorder psychopathology
Timeframe: Change from Baseline (before the intervention), to 6-,12-, and 18-months (end of treatment) after baseline, and 6 months after end of treatment. Specific duration of time over which participant is assessed: 24 months.
Change in Loss of control over eating
Timeframe: Change from Baseline (before the intervention), to 6-,12-, and 18-months (end of treatment) after baseline, and 6 months after end of treatment. Specific duration of time over which participant is assessed: 24 months.
Change in Difficulties in emotion regulation
Timeframe: Change from Baseline (before the intervention), to 6-,12-, and 18-months (end of treatment) after baseline, and 6 months after end of treatment. Specific duration of time over which participant is assessed: 24 months.
Change in Negative urgency
Timeframe: Change from Baseline (before the intervention), to 6-,12-, and 18-months (end of treatment) after baseline, and 6 months after end of treatment. Specific duration of time over which participant is assessed: 24 months.
Change in Psychological impairment
Timeframe: Change from Baseline (before the intervention), to 6-,12-, and 18-months (end of treatment) after baseline, and 6 months after end of treatment. Specific duration of time over which participant is assessed: 24 months.