Mediators and moderators of the effects of a school-based intervention on adolescents' fruit and vegetable consumption: the HEIA study.

Objective: To examine whether targeted determinants mediated the effects of the HEalth In Adolescents (HEIA) intervention on fruit and vegetable (FV) consumption and explore if these mediating effects were moderated by sex, parental education or weight status.

Design: Cluster-randomised controlled trial.

Setting: The HEIA study (2007-2009) was a Norwegian 20-month multi-component school-based intervention to promote healthy weight development.