Non-communicable diseases (NCDs) represent one of the major challenges for public health, requiring prevention strategies and active health promotion ap-proaches that integrate biological, psychological, and social dimensions. Scientific evidence highlights the crucial role of the first 1.000 days of life as a sensitive period for the development of health determinants, in which relational, environmental, and epigenetic factors interact in complex ways. Within this framework, COIRAG’s con-tribution is situated at the intersection of a psychodynamic group approach and com-munity-based interventions, with particular attention to institutional processes and interprofessional dynamics. The article describes the experience developed within Task 6.5 of the European Joint Action on the prevention of NCDs, aimed at promot-ing health in the first 1.000 days through territorial network models and support for parenting. The role of groupality is explored as a transformative device within insti-tutional contexts, highlighting how the construction of a “thinking group” represents an essential condition for sustaining effective prevention processes. From this per-pective, COIRAG’s function is configured not only as a technical and training con-tribution, but as the activation of a thinking function capable of operating across the levels of the individual, the group, the institution, and the community (polis).