Abstract
People with intellectual disability are often excluded from shaping research priorities in areas that directly affect their health, including obesity. This paper describes a co-design process used to develop a research agenda for a PhD program on obesity among adults with intellectual disability. Two Lived Experience Advisory Groups (LEAGs), comprising adults with intellectual disability and supporters, contributed through accessible, participatory activities and discussions and their insights were synthesised into a systems map of influences on weight and health behaviours. This paper describes how participatory qualitative approaches were used to co-design the research question and methods. The paper details how collaborative decision-making, accessibility and lived experience can shape the direction of research. These findings demonstrate the feasibility and value of co-designing research agendas alongside people with intellectual disability, highlighting research agenda setting as a rigorous participatory method that ensures future research is grounded in the priorities, experiences and expertise of those it aims to benefit.