The worldwide rise in obesity makes this the first non-infectious epidemic in human history. The rapid increase is, in fact, influenced more by environment than biology. In an effort to halt the trend, Quebec has launched a major awareness-raising campaign that focuses on healthy environments and targets stakeholders in schools, municipalities, communities and the health sector. The purpose of the present study, then, is to determine how this campaign can promote action towards environments conducive to healthy lifestyles. The theoretical framework is based on planned change. The objectives are to 1) evaluate the quality of awareness-raising methods offered by trainers, and 2) place the impacts of the sessions into perspective. A qualitative approach was prioritized, consisting of two focus groups conducted with 17 trainers. From the standpoint of a healthy environment, sensitization sessions expanded networking, provided a common frame of reference and drove coherent actions for stakeholders involved. As an agent of change, the trainer played a key role in implementing the sessions. The conditions offered encouraged the transition from awareness to information, thereby generating significant results in terms of action. A sensitization session is thus a prerequisite for training transformation activities aimed in innovation.