Patients aged between 18 and 65, of both sexes, of Italian nationality, suffering from obesity (Body Mass Index, BMI: kg/m2 ≥ 35, according to the criteria of the World Health Organization WHO).

Metacognition Questionnaire Penn State Worry Questionnaire Ruminative Response Scale Anger Rumination scale Difficulties in Emotion Regulation Scale Emotional Eating subscale of the Dutch Eating Behavior Questionnaire

Metacognition Questionnaire (MCQ-30) is a self-report test composed of 30 items on a 4-point Likert scale from 1 (I do not agree) to 4 (I completely agree agreement).

Ruminative Response Scale (RRS) is a self-report test composed of 20 items on a 4-point Likert scale from 1 (almost never) to 4 (almost always).

Anger Rumination scale (ARS) is a self-report test composed of 14 items, on a Likert scale from 1 (almost never) to 4 (almost always).

Difficulties in Emotion Regulation Scale (DERS) isa self-report test composed of 36 items on a Likert scale from 1 (almost never) to 5 (almost always).

Emotional Eating subscale of the Dutch Eating Behavior Questionnaire (DEBQ), composed of 13 items on a Likert scale from 0 (never) to 4 (almost always)