Accounting for health literacy and intervention preferences when reducing unhealthy snacking: protocol for an online randomised controlled trial

INTRODUCTION: Health literacy describes the cognitive and social skills that individuals use to access, understand and act on health information. Health literacy interventions typically take the 'universal precautions approach' where all consumers are presented with simplified materials. Although this approach can improve knowledge and comprehension, its impact on complex behaviours is less clear. Systematic reviews also suggest that health …