MyMovez: Intervention promoting young adolescents’ water consumption using their social networks

INTERVENTION: In the social network‐based intervention condition focusing on water intake, peer nomination questions will be used to identify the most influential classmates at baseline. These participants will be trained as influence agents to promote water consumption within their social networks. The training of the influence agents is based on Self‐Determination and Self‐Persuasion Theory. The aim of the training is to provide the influence agents the knowledge (i.e., benefits of the behaviour) and skills to promote water consumption within their social networks. They can promote the behaviour through modelling, messaging, and through self‐developed and selected videos and pictures about the benefits of drinking water. In the mass media intervention condition focusing on water intake, a researcher will give a presentation in the classrooms about the benefits of drinking water. In addition, we will spread the videos and pictures about the benefits of drinking water as in the social network‐based condition CONDITION: Overweight, Obesity ; ; PRIMARY OUTCOME: water consumption SECONDARY OUTCOME: sugar‐sweetened beverage consumption INCLUSION CRITERIA: Young adolescents between the ages of 9 and 16 years old and attending normal education