ABSTRACT
Interventions to prevent unhealthy weight gain should aim at making a change in energy balance related behaviours (EBRB) [1]. The consump-
tion of sugar-sweetened beverages (SSB), television viewing and computer use are behaviours that have been associated with increased risk for obesity [2]. Lack of effective school-based obesity prevention interventions [3,4] has initiated a debate about the best intervention strategies and evaluation designs [4,5]. Intervention strategies tailored to specific subgroups (like gender) [3,6], including family components [7,8], and evaluated by the target groups [9] seem needed in order to examine for whom and why obesity prevention programmes works.
