Diet is one of the ‘big three’ modifiable health behaviours (together with sleep and physical activity) (Wickham et al., 2020). The World Health Organization (WHO, 2020) defines a healthy diet as achieving energy balance, limiting energy intake from total fats, free sugars and salt and increasing consumption of fruits and vegetables, legumes, whole grains and nuts. Regular consumption of a wide variety of foods from key food groups in the right proportions and consuming the right amount of food and drink are conducive to achieving, improving, enhancing and maintaining a healthy body weight (National Health Service (NHS), 2022) and health by reduction of the risk of chronic illness (WHO, 2020).