Purpose – Self-efficacy has often been found to play a significant role in healthy dietary behaviours. However, self-efficacy interventions most often consist of intensive interventions. The authors aim to provide more insight into the effect of brief self-efficacy interventions on healthy dietary behaviours. Design/methodology/approach – In the present article, two randomized controlled trials are described. In study 1, a brief self-efficacy intervention with multiple self-efficacy techniques integrated on a flyer is tested, and in study 2, an online brief self-efficacy intervention with a single self-efficacy technique is tested. Findings – The results show that a brief self-efficacy intervention can directly increase vegetable intake and indirectly improve compliance to a diet plan to eat healthier. Originality/value – These findings suggest that self-efficacy interventions do not always have to be intensive to change dietary behaviours and that brief self-efficacy interventions can also lead to more healthy dietary behaviours.

中文翻译：

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增加健康饮食行为的简短自我效能干预：来自两项随机对照试验的证据

目的——人们经常发现自我效能感在健康饮食行为中起着重要作用。然而，自我效能干预通常由强化干预组成。作者旨在更深入地了解简短的自我效能干预对健康饮食行为的影响。设计/方法/途径——本文描述了两项随机对照试验。在研究 1 中，测试了在传单上集成了多种自我效能技术的简短自我效能干预，在研究 2 中，测试了使用单一自我效能技术的在线简短自我效能干预。调查结果——结果表明，简短的自我效能干预可以直接增加蔬菜摄入量，并间接提高对饮食计划的依从性，从而吃得更健康。