The rates of diet-related health problems and obesity are undoubtedly some of the most critical agendas of the 21st century. Despite decades of public-health attention, education agendas and personal efforts, rates of overweight and obesity have continued to rise over the past 30 years, with 63% of adults and 27% of children (aged 5–17 years) in Australia currently overweight or obese (Australian Bureau of Statistics [ABS], 2013; ABS, 2015; Australian Institute of Health and Welfare [AIHW], 2018; Olds et al., 2010). Among young adults (18–24 years of age) in particular, overweight and obesity increased by 18% over a three-year period (2014/15–2018) (AIHW, 2018). Likewise, in a pattern evident since 2007, national data indicate that 49% of Australian adults fail to eat the recommended intakes of fruit and 92% do not consume the recommended intakes of vegetables (AIHW, 2018). Furthermore, Australian adults and youth derive 33–41% of their daily energy from discretionary foods: equivalent to 5–8 serves per day, compared with the recommended 0–3 serves per day (AIHW, 2018)