The authors describe the experience of an action-research, developed in schools, promoted by the LILT of Padua in the prevention of eating risky behavior. They are drawn up some reflections about theoretical and methodological implications of an intervention that applies to the class groups, which proposes to activate the multiple dimensions - bodily, emotional, social - evolutionarily and inevitably involved. The authors highlight the importance of the group setting and reflect on the different functions of the co-conduction. It proposes a reflection on the use of images as "instruments mediators" that facilitate the activation of an intermediate area and creative, enriching in terms of libidinal and emotional representations co-constructed in group. Whereas a narcissistic increasingly fragility and a "fragmentation" that reverberates even in institutional operations, it’s highlighted the centrality of work integration between biological body and emotional body, as well as the value of a strengthening of social networks acknowledge to a generative dialogue between psychoanalysis and social areas.
Keywords: Adolescence, alimentation, prevention, class groups, body, images.