 The Opticourses project aims to improve the nutritional qualityprice NQP ratio of the food purchases of people claiming to be facing financial problems. Following one of the main principles of the French National Nutrition and Health Program PNNS, the project starts from the principle that to modify food consumption favourably and durably, one must act on both the demand and the supply see figure. The demand part of the project is based on participatory workshops, and the supply part relies on intervention of social marketing in shops. 