How Altered Gut-Brain-Axis Influences Food Choices: Part 2 (BrainFood)

Each participant will be asked to fill a web-based questionnaire that captures sociodemographic, lifestyle, physical and mental health information (Survey) and dietary intake patterns (FFQ). This will be done pre-treatment (only for those included pre-treatment), 6 months after the start of obesity treatment, 1 year after the start of the treatment and then yearly until 5 year after the start of the treatment.

"Participants will create their BitsaboutMe-account (GDPR-compliant data sharing platform from Bern, Switzerland) with the help of study team members. Data from digital receipts will be obtained from Migros Cumulus and Coop Supercard via their BitsaboutMe-account. The data collection allow retrospective digital receipts collection for up to 2 years and automatically continuous collection during study duration.~GDPR: General Data Protection Regulation"