Reducing the prevalence of diet-related diseases, such as obesity and liver cirrhosis, is a targeted aim of the UK and other governments. Professor Rachel Griffith’s research has had impact through providing new analysis, methods and evidence to inform decision makers and the public about the design and effectiveness of policies that are intended to meet this target, most notably corrective taxes and advertising restrictions. Her work has directly influenced the methods used and the actions taken by policy makers in both the Department of Health and Social Care (DHSC) and HM Treasury (HMT). Specifically, her work has had impact on recent policy proposals to restrict advertising of high in fat, salt and/or sugar (HFSS) foods, and provided evidence to inform the design of alcohol and soda taxes.