Effective strategies to increase energy expenditure and reduce energy intake are being sought by countless agencies around the world. One key strategy will be to enhance health literacy across the population so that everyone will be able to easily understand the energy density of the available foods and drinks. Many countries require that food and drink labels include information on the composition of the food in terms of nutrients, fats, sugars (or overall energy density) and other constituents. However, many people find this information difficult to interpret.1 Furthermore, take-away food is usually not accompanied by any information about its constituents or energy density.