Study: NCT03486210

Intervention type: BEHAVIORAL
Intervention: Food preference
Description: The study will take place in two phases. A first phase will consist in the validation of translations and the selection of images on 20 healthy volunteers and 20 health professionals specialized in nutrition. They will have to fill a form with images of food and evaluate to what extend they think the pictures represent what we can eat in France. This step will adapt the questionnaire to our country.

Intervention type: BEHAVIORAL
Intervention: Food preference
Description: The study will take place in two phases. A first phase will consist in the validation of translations and the selection of images on 20 healthy volunteers and 20 health professionals specialized in nutrition. They will have to fill a form with images of food and evaluate to what extend they think the pictures represent what we can eat in France. This step will adapt the questionnaire to our country.

Intervention type: OTHER
Intervention: Psychological assesment
Description: Phase performed with patients fasting for at least 2 hours before the different tests. The FLPQ will be compared between a group of patients suffering from unoperated obesity (OCt), a group of patients operated on a sleeve gastrectomy (OSl) and a group operated by a bypass (OBy) between 6 and 24 months post-surgery, randomized for the 6 combined tests (2 categories). The award can be made in 2 sessions of at least 3 of the 6 tests combined. Each test combines 2 of the 11 categories. The test will consist of 96 pairs of 16 food images presented on a computer screen in color. Participants will be invited to choose the food they most want to eat, by pressing the corresponding computer button (choices saved by counting the frequency scores in E-prime).~The level of hunger will be evaluated by an Analogical Visual Scale, ranging from 0 to 10.~Patients should also complete 3 self-questionnaires used routinely (Binge Eating Scale, The Yale Food Addiction Scale, The UPPS-P short version).

Intervention type: OTHER
Intervention: Psychological assesment
Description: Phase performed with patients fasting for at least 2 hours before the different tests. The FLPQ will be compared between a group of patients suffering from unoperated obesity (OCt), a group of patients operated on a sleeve gastrectomy (OSl) and a group operated by a bypass (OBy) between 6 and 24 months post-surgery, randomized for the 6 combined tests (2 categories). The award can be made in 2 sessions of at least 3 of the 6 tests combined. Each test combines 2 of the 11 categories. The test will consist of 96 pairs of 16 food images presented on a computer screen in color. Participants will be invited to choose the food they most want to eat, by pressing the corresponding computer button (choices saved by counting the frequency scores in E-prime).~The level of hunger will be evaluated by an Analogical Visual Scale, ranging from 0 to 10.~Patients should also complete 3 self-questionnaires used routinely (Binge Eating Scale, The Yale Food Addiction Scale, The UPPS-P short version).

Intervention type: OTHER
Intervention: Psychological assesment
Description: Phase performed with patients fasting for at least 2 hours before the different tests. The FLPQ will be compared between a group of patients suffering from unoperated obesity (OCt), a group of patients operated on a sleeve gastrectomy (OSl) and a group operated by a bypass (OBy) between 6 and 24 months post-surgery, randomized for the 6 combined tests (2 categories). The award can be made in 2 sessions of at least 3 of the 6 tests combined. Each test combines 2 of the 11 categories. The test will consist of 96 pairs of 16 food images presented on a computer screen in color. Participants will be invited to choose the food they most want to eat, by pressing the corresponding computer button (choices saved by counting the frequency scores in E-prime).~The level of hunger will be evaluated by an Analogical Visual Scale, ranging from 0 to 10.~Patients should also complete 3 self-questionnaires used routinely (Binge Eating Scale, The Yale Food Addiction Scale, The UPPS-P short version).