This is a protocol for a Cochrane Review (prototype). The objectives are as follows:

• To assess the effects of weight-neutral interventions for managing obesity in children and adults (quantitative data).

• To explore the views, perspectives and experiences of children and adults receiving the intervention, their close family members or, if appropriate, carers, and healthcare personnel who recommend or deliver weight-neutral interventions to determine their feasibility and acceptability and any factors that create barriers and facilitators to optimal implementation (qualitative data).

• To determine whether the programme theories, components and delivery of interventions take account of the views, perspectives and experiences of intervention recipients and whether patient-centred interventions have greater effects.