Adherence
Exposure to educational Planetary Health Plate (PHP) signage in a university dining hall significantly reduces the rate at which patrons take meat dishes, but does not significantly reduce the total weight of meat consumed or the average serving size.
Educational signage alone may not reduce total meat consumption in a buffet setting. While it can discourage some people from taking meat entirely, it does not reduce portion sizes. To reduce total intake, interventions must address portion control or serving sizes directly, not just information provision.
Exposure to an educational plate graphic decreased the proportion of patrons taking meat but had no impact on total meat consumption or meat-dish serving weight.
Why this rating
Randomized controlled trial with objective measures, but limited by small sample size (8 data points) and potential confounders (menu changes, stress).
Source
Effects of an educational planetary plate graphic on meat consumption in a Stanford University dining hall: a randomized controlled trial
Alessandra Marcone et al. · BMC Nutrition · 2023
DOI 10.1186/s40795-023-00764-3
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