Body image concerns are prevalent among adolescents; however, a single item assessing what influences their body image does not exist. Thus, the aim of this study was to develop a survey item on the factors influencing adolescent body image for inclusion in a nationally representative health behaviour survey. This article describes the methodology used to develop a survey item and the results obtained through its inclusion in the survey. The research design included a literature review, consultation work with young people and data analyses of the new survey item included in the survey. Results from the current study revealed that a variety of factors influence adolescent body image, some of which have been overlooked in the traditional body image literature to date. This study demonstrates consultation with young people can contribute to the development of quantitative measures.