Marcone Alessandra L, Darmstadt Gary L, Challamel Ghislaine Amsler, Mathur Maya B, Gardner Christopher D
Stanford Prevention Research Center, Stanford University School of Medicine, Stanford, CA, USA.
Department of Pediatrics, Stanford University School of Medicine, Stanford, CA, USA.
BMC Nutr. 2023 Sep 25;9(1):106. doi: 10.1186/s40795-023-00764-3.
Assess the impact of an educational Planetary Health Plate (PHP) graphic on meat-related dietary choices of Stanford University dining hall patrons using a randomized controlled trial crossover design. All patrons entering the dining hall during study periods were enrolled as participants. Control, n = 631; PHP, n = 547.
Compare dietary behavior without signage to behavior while exposed to PHP during four equivalent dinner meals. The primary outcome was total meat-dish weight adjusted for the number of people entering the dining hall. Secondary outcomes included the number of meat-dish servings and average meat-dish serving weight. Analysis using T-tests, Poisson generalized linear model.
Differences in total meat-dish weight, (1.54 kg; 95% Confidence Interval [CI] = -4.41,1.33; P = .19) and average meat-dish serving weight (0.03 kg; 95% CI = 0.00, 0.06; P = .07) between PHP and control patrons did not reach significance. The rate at which PHP patrons took meat was significantly lower (Incidence Rate Ratio 0.80; 95% CI = 0.71, 0.91; P < .001).
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. Statistical methods used in this study may inform future investigations on dietary change in the dining hall setting. Further research on the role of educational signage in influencing dietary behavior is warranted, with an aim to improve human health and environmental sustainability.
ClinicalTrials.gov, NCT05565859, registered 4 October 2022.
采用随机对照试验交叉设计，评估教育性的行星健康餐盘（PHP）图形对斯坦福大学食堂顾客与肉类相关的饮食选择的影响。在研究期间进入食堂的所有顾客均被纳入为参与者。对照组，n = 631；PHP组，n = 547。
比较在四顿等量晚餐中，无标识时的饮食行为与接触PHP时的饮食行为。主要结局是根据进入食堂的人数调整后的肉类菜肴总重量。次要结局包括肉类菜肴的份数和平均肉类菜肴份量。使用t检验、泊松广义线性模型进行分析。
PHP组和对照组顾客之间，肉类菜肴总重量的差异（1.54千克；95%置信区间[CI]= -4.41,1.33；P = 0.19）和平均肉类菜肴份量的差异（0.03千克；95% CI = 0.00, 0.06；P = 0.07）均未达到显著水平。PHP组顾客选择肉类的比率显著更低（发病率比0.80；95% CI = 0.71, 0.91；P < 0.001）。
接触教育性餐盘图形降低了选择肉类的顾客比例，但对肉类总消费量或肉类菜肴份量没有影响。本研究中使用的统计方法可能为未来食堂环境中饮食变化的调查提供参考。有必要进一步研究教育标识在影响饮食行为中的作用，以改善人类健康和环境可持续性。
ClinicalTrials.gov，NCT05565859，于2022年10月4日注册。
