Department of Psychology, Catholic University of the Sacred Heart, 20123 Milan, Italy.
Nutrients. 2022 Dec 21;15(1):15. doi: 10.3390/nu15010015.
In the present research, we analyzed how to promote a plant-based diet by involving 428 volunteers in a 2-week mobile app intervention. We compared messages promoting the addition of legumes versus messages promoting the replacement of meat with legumes. Messages were either combined or not combined with dynamic norms (i.e., information that more and more people are enacting the behavior). We compared these messages with a control condition (i.e., no message intervention) and we also analyzed the moderation effect of receivers' identification with flexitarians (i.e., people who occasionally eat animal products) and attitudes towards them. In the short term, addition messages increased legume consumption more than replacement messages, especially in people with a negative evaluation of flexitarians and low identification with them. In the long term, increased legume consumption was recorded only when addition messages were combined with dynamic norms. As for meat consumption, the replacement messages were more effective in reducing it in the short term than in the long term, especially in people with positive attitudes towards flexitarians. However, replacement messages combined with dynamic norms were more effective in the long term than in the short term. These results advance our comprehension of how to tailor dietary messages.
在本研究中，我们分析了如何通过让 428 名志愿者参与为期 2 周的移动应用程序干预来促进植物性饮食。我们比较了推广添加豆类与推广用豆类替代肉类的信息。这些信息要么与动态规范（即越来越多人正在实施该行为的信息）相结合，要么不结合。我们将这些信息与对照组（即无信息干预）进行了比较，还分析了接收者对弹性素食者（即偶尔食用动物产品的人）的认同和对他们的态度的调节作用。在短期内，添加信息比替代信息更能增加豆类的食用量，尤其是在对弹性素食者评价负面且认同度低的人群中。从长期来看，只有在添加信息与动态规范相结合时，豆类的食用量才会增加。至于肉类消费，替代信息在短期内比长期更能有效减少肉类消费，尤其是在对弹性素食者持积极态度的人群中。然而，与动态规范相结合的替代信息在长期内比短期更有效。这些结果增进了我们对如何定制饮食信息的理解。
