Mindfulness in Preparation to Bariatric Surgery

Inclusion Criteria: * Adult patients: over 18 years * Patients suffering from morbid obesity (BMI ≥ 40 kg/m²), or severe obesity (BMI ≥ 35 kg/m²) associate with at least a comorbidity likely to be improved by surgery * Patient revised in second-line after the failure of a well conducted medical treatment, nutritional, dietetic and psychotherapeutic during 6 to 12 months : absence of enough weight loss or absence of maintain of weight loss * Absence of any psychiatric counter-argument Exclusion Criteria: * Subjects responding to inclusion criteria of the French National Authority for Health * Subjects without agoraphobia, or obsessive-compulsive disorder, in post-traumatic stress disorder, alcohol or drugs dependant, without psychotic disorders, major depressive disorder, or suffering from anti-social personality disorder * Patient registered for social security * Free, signed and informed consent