This document outlines a research project studying the diffusion of social economy innovations in sustainable food. The research will examine innovations in organic/seasonal production, financing, food baskets, and short supply chains. It will analyze diffusion trajectories like deepening, widening, imitation, and certification. The research questions investigate the practices, trajectories, enabling factors, and implications of diffusion. Methods include quantitative analysis of 15 years of data on production/consumption actors and qualitative analysis of 10 initiatives per city to understand rationales and impacts. The research will collaborate across universities in Liège, Lille, and Manchester.