Patient randomized in the placebo group will be started one month after surgery on a progressive numbers of matched placebo tablets up to 2 tabs twice a day. Duration of therapy will be 24 months.

Evaluates severity of cravings using a validated questionnaire. Minimum : 39; Maximum : 234; Higher scores mean a worse outcome.

Decrease in food explicit and implicit wanting and liking food reward assessed by Leeds Food Preference Questionnaire using a computerized behavioural task

36-item short form survey evaluating quality of life on a scale from 0 to 100, higher scores indicate better quality of life

Laval questionnaire evaluating quality of life on 6 aspects on a scale from 0 to 7, higher scores indicate better quality of life

HAD questionnaire includes 14 rated items from 0 to 3. Seven questions relate to anxiety (total A) and seven others to the depressive dimension (total D), obtaining two scores (maximum score of each score = 21). Higher scores indicate a worse outcome

Gastro-intestinal side-effects assessed by GIQLI questionnaire on a scale from 0 to 144. Higher scores indicate better quality of life

To assess the presence of certain binge eating behaviors that may be indicative of an eating disorder.

The higher the score, the more binge eating behaviors is observed. The minimum score is 0 while the maximum score is 46. The final result allows to say if the person has an absent (less than 17), moderate (between 18 and 26) or severe (more than 27) binging level.

The YFAS 2.0 was designed to assess food addiction. It assesses the symptoms of food addiction and the resulting distress and impaired functioning.

The higher the level of symptoms, the more severe the food addiction. Impaired functioning and distress are scored from 0 to 2. Symptoms are scored from 0 to 11. If the functioning and distress score is 1 and above, the food addiction may be mild (2-3 symptoms), moderate (4-5 symptoms), or severe (6+ symptoms).