Investigating young people’s physical activity and eating behaviours and how best to provide support: Triangulating data from young people, practitioners, and commissioners

Physical activity and diet quality decline during the adolescent years, putting young people at risk of health conditions and failure to reap health benefits. Therefore, interventions are warranted to support young people to be active and eat healthily. Guidance on the development of such complex interventions advises on engagement with stakeholders, both service users and professionals.