*2.1. Participants and Procedure*

Participants were recruited online from a German obesity center of excellence and via social media from 10 May to 7 July 2020. Two hundred fifty-four participants (223 female, 31 male) completed the study: 114 participants (99 female, 15 male) did not (yet) have an obesity surgery, while 140 (124 female, 16 male) did already undergo obesity surgery. Mann–Whitney tests did not reveal significant gender differences between the with and without surgery groups (U = 8070.00, *p* = 0.944), but difference in age between surgery groups was significant (U = 6764.50, *p* = 0.019). Table 1 lists all sociodemographic and medical data, including age and gender distributions of both groups. Electronic informed consent was given and confirmed by all participants. Participation was voluntary and anonymous, and participants could withdraw from the study at any time. The proposed study was conducted in accordance with the Declaration of Helsinki, and the local Ethics Committee of the Medical Faculty approved this study (20-9307-BO).


**Table 1.** Sociodemographic characteristics separately for both groups (with and without surgery).
