“…Together, these previous syntheses provide clear indications that social norms play a role in food intake (Robinson, Blisset, et al, 2013;Robinson, Thomas, et al, 2014) and provide an account of the (evolutionary) mechanisms explaining why human beings follow social norms related to eating (Higgs, 2015). However, the potential for social norms to improve health behaviour, including food intake, is by no means ubiquitous, with various studies also showing null effects or even negative results (for an overview, see Cameron & Campo, 2006). Due to potential publication bias, it is possible that additional unpublished studies exist that also showed no relation between social norms and food intake.…”