“…At least one intervention tested labelling formats (system 2 nudges), partially in combination with explanatory information in all settings. For this intervention type, we presented the results of the NAHGAST sustainability calculation tool on a pretested label (Langen et al, 2017), which combined all evaluated sustainability dimensions -environment, health and fairness -on a colour scale from red to green (see Appendix Figure A4, A5). During the information intervention weeks, this label was displayed in an A4 sized advertising stand at the food counter without any explanation ('label only' in Table 4) and with additional information (label plus information nudge).…”