There is a growing body of research into "sustainable diets" which is a diet with low environmental impact, which contributes to food and nutrition security and a healthy life for present and future generations (1) . An important aspect of achieving a sustainable diet is a reduction in food waste (2) . The current study aimed to determine the factors influencing food waste using data collected during the National Children's and Teens Food Surveys (NCFSII and NTFSII) (3) .