In the last decade, labels have been multiplying on food products (e.g., organic labels, Nutri- Score) to foster nutritious and sustainable food purchases, as such raising the question of the effect of multi-labelling. In this article, we use the prism of information processing and specifically address the question of multi-labelling when the labels have simultaneously positive and negative valences. Such a situation could confuse consumers and therefore, harm multi-labelling ability to empower consumers. An experiment shows that 1/ adding a good Eco- Score to a good Nutri-Score enhances warm glow among the most ecology-sensitive consumers, though it does not significantly increase purchase intentions, 2/ adding a bad Eco- Score to a good Nutri-Score increases consumer confusion (i.e., a discomfort due to ambiguous stimuli that requires mental efforts to cope with) but does not decrease purchase intentions. Recommendations to food managers and public policy makers result from these results.

• Axelle Dorisse(UCLoubvain, Belgium)
• Karine Charry(UCLoubvain, Belgium)
• Béatrice Parguel(Université Paris Est Créteil, France)