Action planning interventions can effectively promote fruit and vegetable (FV) consumption, but not much is known about the day‐to‐day translation of intervention planning into action. In this randomized controlled trial, immediate intervention effects of a very brief planning intervention on FV consumption during the following 13 days were investigated. After a 13‐day pre‐intervention diary, N = 206 participants (aged 19–66 years) were randomly allocated to a waiting‐list control condition or a planning condition, where they formed one FV plan. Participants from both conditions completed a 13‐day post‐intervention diary. Self‐reported daily FV consumption, FV‐specific self‐efficacy, and action control were assessed. Segmented linear mixed models estimating a discrete change (i.e. “jump”) between diary phases showed a positive “jump” of FV intake and self‐efficacy in the planning condition when compared to the control condition. For action control, such effects were not observed. Changes in study variables throughout the post‐intervention phase did not differ between both conditions. Present findings extend previous evidence on action planning interventions by showing that increases in self‐regulatory (i.e. self‐efficacy) and behavioral (i.e. FV intake) outcomes can occur very rapidly and already on the first day for which behavioral increases were planned.

中文翻译：

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非常简短的计划干预对水果和蔬菜消费的直接影响：一项随机对照试验

行动计划干预可以有效促进水果和蔬菜 (FV) 的消费，但对干预计划日常转化为行动的了解并不多。在这项随机对照试验中，研究了非常简短的计划干预对接下来 13 天内 FV 消耗的即时干预效果。在 13 天的干预前日记后，N = 206 名参与者（19-66 岁）被随机分配到等候名单控制条件或计划条件，在那里他们形成一个 FV 计划。两种情况的参与者都完成了为期 13 天的干预后日记。评估了自我报告的每日 FV 消耗量、FV 特定的自我效能和行动控制。估计日记阶段之间的离散变化（即“跳跃”）的分段线性混合模型显示，与控制条件相比，计划条件下的 FV 摄入量和自我效能呈正“跳跃”。对于动作控制，没有观察到这种效果。在整个干预后阶段，研究变量的变化在两种情况下没有差异。目前的研究结果通过显示自我监管的增加（即