Co-creation and implementation of a healthy lunch at Dutch primary schools in disadvantaged neighbourhoods: design of a cluster randomised cross-over effectiveness study.

Introduction: The majority of children fails to have a healthy diet. Providing a healthy lunch at school is a way to target all children, regardless of ethnic and socioeconomic background. This study aims to investigate the effectivity and feasibility of a co-created healthy school lunch in disadvantaged neighbourhoods of the city of Rotterdam, the Netherlands.