Fig. 1

Study procedures and assessment points of the trial

Abbreviations. BDI, Beck Depression Inventory; BIS-15, short version of the Barratt Impulsiveness Scale; DLPFC, dorsolateral prefrontal cortex; EDE-BSV, Eating Disorder Examination Interview – Bariatric Surgery Version; EDE-Q, Eating Disorder Examination Questionnaire; FAAQ, Food Craving Acceptance and Action Questionnaire; FCQ-S, Food Cravings Questionnaire-State; FCQ-T, Food Cravings Questionnaire-Trait-reduced; FEV, Three Factor Eating Questionnaire; GLP-1, glucagon like peptide-1; Mini-DIPS, Diagnostisches Kurz-Interview bei psychischen Störungen; PHQ-D, Patient Health Questionnaire; PYY, peptide YY; QOLOS, Quality of Life for Obesity Surgery; t0, baseline after the sleeve gastrectomy; t1, 4 weeks after the tDCS intervention; t2, 3 months after the tDCS intervention; tDCS, transcranial direct current stimulation; UPPS, Impulsive Behavior-Scale; WHO-5, well-being index