 All participants will be asked to complete several questionnaires i.e. demographics, clinical data, SF-36, GAD-7 and PHQ-9, FFQ, SQUASH, and Baecke, and to undergo anthropometric measurements. Furthermore, blood, urine, faeces and exhaled air will be collected and a fibroscan and DEXA-scan will be performed. Additionally, participants will be asked to participate in a multi-sugar test for intestinal permeability. 