Mediterranean diet adherence and food waste among university students

Abstract Introduction The Mediterranean diet (MD) is widely acknowledged as both a nutritious and sustainable dietary option. Growing research indicates that dietary habits can impact the amount of food waste produced. The aim of the study was to assess the correlation between adherence to the MD and food waste behavior among university students. Methods A cross-sectional study employing a validated, anonymous, online questionnaire was conducted among students at the University of Milan. Food waste was measured using the Italian version of the Household Food Waste Behavior (HFWB) questionnaire, while adherence to the MD was assessed through the Medi-Lite questionnaire. The questionnaire was developed in Microsoft Forms. Data were collected between July and October 2023. Responses to the HFWB were scored from 1 for disagreeing responses to 7 for agreeing resposes. Pearson correlation (ρ) between MD adherence and anti-waste behavior, stratified by gender and for the overall population was calculated. Results A total of 2,617 students (70% females, age 18-23 years 52%) completed the questionnaire. The average MD adherence score was 10.2 (± 2.2), with 65% of the sample being adherent to the MD. MD score was higher among female (10.4), compared to males (10.1, p < 0.001). Females show a more anti-waste behavior (score=5.3±0.8) compared to males (score=5.2±0.7, p < 0.001). MD adherence statistically significant correlated with anti-waste behavior in the overall sample (ρ = 0.27; 95% CI 0.24-0.31, p < 0.001) and within each gender group (Females: ρ = 0.27; 95% CI 0.22-0.35, p < 0.001; Male: (ρ = 0.28; 95% CI 0.22-0.35, p < 0.001) Conclusions This study provides evidence of the weak, positive correlation between adherence to the MD and household food waste behavior. Advocating for the MD could enhance health while simultaneously lowering food waste levels, which may have beneficial effects on environmental sustainability and the management of food resources. Key messages • Adherence to the Mediterranean diet linked to lower food waste among university students. • Mediterranean diet promotes health and less waste, aiding environmental sustainability.