Picky eating in children can undermine dietary diversity and the development of healthy eating habits, while also creating recurring tension in family feeding routines. Prior interventions have explored food-centered designs, enhanced utensils, and mealtime interactive systems, but few position children as active participants in intervention processes that extend beyond single mealtime interactions. To better understand everyday responses to picky eating and child-acceptable intervention mechanisms, we conducted a formative study with caregivers and kindergarten teachers. Based on the resulting design considerations and iterative stakeholder review, we designed StoryEcho, a generative child-as-actor storytelling system for picky eating intervention. StoryEcho engages children outside mealtimes through personalized stories in which the child appears as a persistent story character and later shapes story development through real-world food-related behavior. The system combines non-mealtime story engagement, lightweight post-meal feedback, and behavior-informed story updates to support repeated intervention across everyday family routines. We evaluated StoryEcho in a between-group field study with 11 families of preschool children. Results provide preliminary evidence that StoryEcho can significantly increase children's willingness to approach and try target low-preference foods while reducing parental pressure around feeding. These findings suggest the promise of generative child-as-actor storytelling as a design approach for home-based behavior support that unfolds through recurring family routines.

翻译：儿童挑食行为不仅会损害膳食多样性和健康饮食习惯的养成，还会在家庭喂养过程中反复引发紧张关系。现有干预措施主要聚焦食物中心化设计、增强型餐具及进餐互动系统，但很少有研究将儿童定位为超越单一进餐互动的干预过程中的主动参与者。为深入理解日常生活中对挑食行为的应对策略及儿童可接受的干预机制，我们与看护者及幼儿园教师共同开展了一项形成性研究。基于得出的设计考量与利益相关者迭代评估，我们设计出StoryEcho——一种用于挑食干预的生成式儿童参与式讲故事系统。该系统通过个性化故事在非进餐时间吸引儿童参与，故事中儿童作为持续出现的角色，并通过现实世界中的饮食相关行为塑造故事发展。系统融合了非进餐时间的故事参与、轻量级餐后反馈以及基于行为信息更新的故事内容，从而在日常生活场景中实现反复干预。我们针对11个有学龄前儿童的家庭开展了一组间实地研究对StoryEcho进行评估。初步证据表明，StoryEcho能显著提升儿童接近并尝试目标低偏好食物的意愿，同时降低家长在喂养过程中的施压行为。这些发现表明，以生成式儿童参与式讲故事作为设计方法，通过家庭日常重复行为开展居家行为支持具有重要应用前景。