Food waste concerns, eating behaviour and body weight

Consumer food waste is now a significant social issue. However, given that the modern day food environment has become characterised by larger portion sizes of more energy-dense foods, personal concerns about wasting food may result in eating behaviours that promote excess energy intake and weight gain. Across 3 studies, we developed a brief (5-item) measure to quantify concerns about food waste and examined the relationships between food waste concerns, eating behaviour and body weight. In Study 1, we showed that our 5-item measure of food waste concerns has acceptable convergent and divergent validity, and test-retest reliability. We also found that concerns about wasting food were predictive of greater behavioural intentions to avoid food waste (e.g. eating leftovers). In Study 2, greater food waste concerns were associated with an increased tendency to plate-clear when eating (self-reported), but not with objectively measured body weight or likelihood of having overweight or obesity. In Study 3, we examined how much food participants consumed when served a large portion size of a lunchtime meal and found that food waste concerns did not directly or indirectly predict how much participants ate. Overall, we found evidence that concerns about food waste are related to self-reported intentions to minimize food waste and plate-clearing tendencies, but no evidence that food waste concerns are related to objectively measured energy intake in the laboratory or body weight.