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Overcooking and overbuying are two main causes of food waste in households. Therefore, this study tests whether two interventions, aimed at cooking planning versus purchasing planning, can reduce food waste in households by using self-report direct measurements. Because measuring household food waste can impact how much food is wasted, the effects of the mere measurement of household food waste over time were assessed as well.

A sample of 80 households was distributed into three groups (control, purchasing planning and cooking planning) and their household food waste was weighed over a period of 166 days. After the first 91 days, behavioral interventions were delivered to purchasing planning and cooking planning groups. Repeated measures ANOVA, linear regression and a two-level mixed model were used for data analysis.

Results showed that the interventions were not effective in influencing the participants to reduce household food waste beyond the reduction in the control group. However, there is evidence of a mere measurement effect that caused household food waste reduction over time.

This study's experimental period is longer than most of the studies that tested behavioral interventions for household food waste reduction. This enabled the authors to assess the effects of repeated measurement and discover that measurement alone can bring behavioral change.