Food-related mobilizations and protests include a wide range of practices, from collective acts by producers or consumers to organized social and political movements, from efforts taking place in small local areas to those involving national or international scales of action. Starting from a large and inclusive definition of « food activism », this paper aims to discuss on forms, ideas and practices of food activism that we can observe in Europe. What are the boundaries of food activism and how can we study it? What kinds of economy do « food activists » imagine or practice? What positions do activists defend and what political strategies do they employ inside Europe? Using two case studies - the international Slow Food movement and vegetable baskets systems like AMAP - I will put forward some hypotheses about the paradigms and practices of such activism. Discussing food activism allows us to understand not only the changes that occur over time in the forms of mobilization and their aims, but also links and connections between different food activisms. And it allows us to reflect also about our paradigms and our practices of research.