Primary outcome
The primary outcome was the environmental impact (EF single score in mPt per kg of product) of the food products selected in each task. The environmental impact of the composed meal for Task 1 was calculated as the mean of the EF single scores per kg of the three selected meal components in each scenario. The environmental impact of the ready-to-eat meal for Task 2 of each scenario was defined as the EF single score per kg of the selected product. Other indicators were calculated in the same manner: greenhouse gas emissions (GHGE), ozone depletion and particulate matter.