Teen screen diets and their relationships with dietary intake: setting the stage for precision interventions and evidence-based policies

青少年的饮食行为受媒介环境的影响。然而， 关于青少年在智能手机上体验的与食物和饮料相关的环境。 青少年越来越多地通过智能手机屏幕与世界互动， 他们因此，任何试图研究或改变政策、制度和环境对 青少年的饮食偏好、购买和消费必须考虑营养成分- 智能手机屏幕上的相关环境和行为。到目前为止，全面的生活观 智能手机上的经验对研究人员来说是不可见的。我们开发了一种新的方法， 捕捉青少年智能手机屏幕上出现的一切--一个完全加密的数字生活记录-- 通过每5秒拍摄一次设备打开时的屏幕快照。 屏幕截图，包括屏幕上的所有文字和图像，构成了一个人的屏幕。 我们将收集六个月连续的智能手机截图和三次24小时的饮食回忆 在基线和2，4和6个月后，从全国样本的300名青少年13- 17岁，男女平衡，至少30%被确定为种族/少数民族。 目标1.描述青少年在智能手机上体验的餐饮环境 屏幕使用智能手机屏幕组中的文本和图像，我们将创建第一个全面的 描述青少年在他们的饮食环境中所经历的食物和饮料。 智能手机 目标2.阐明智能手机食品和饮料之间的人际关系 screenomes和饮食摄入。我们将研究数字暴露于食物和 饮料筛选特征与饮食消费的差异有关。 目标3。阐明智能手机食物变化与 饮食摄入量的变化。充分利用嵌入在 screenome数据 这项研究将首次全面描述食品和饮料环境， 青少年在智能手机上的体验，代表了研究媒体的真正范式转变 对青少年饮食行为的影响。这项研究的结果将确定新的干预目标 以及基于智能手机的精准营养干预措施和循证政策的机会， 改善青少年健康。

Adolescents’ eating behaviors are influenced by their media environments. However, very little is known about the food and beverage-related environment that adolescents experience on their smartphones. Adolescents increasingly interact with the world through smartphone screens that are almost always with them. Thus, any attempt to study or change policy, systems and environmental influences on adolescents’ food and beverage preferences, purchases and consumption must consider the nutrition- related environment and behavior on their smartphone screens. Until now, a comprehensive view of life experienced on smartphones has been invisible to researchers. We have developed a novel method for capturing everything that appears on teens’ smartphone screens – a fully encrypted record of digital life – by taking snapshots of the screen every 5 seconds the devices are on. The resulting sequence of screenshots, including all words and images on the screen, constitute an individual’s screenome. We will collect six months of continuous smartphone screenshots and three 24-hour dietary recall interviews at baseline and after 2, 4, and 6 months, from a national sample of 300 adolescents age 13- 17 years, balanced between female and male, and at least 30% identified as racial/ethnic minority. Aim 1. Describe the food and beverage environment adolescents experience on their smartphone screens Using the text and images from smartphone screenomes, we will create the first comprehensive description of the food and beverage environments being experienced by adolescents on their smartphones. Aim 2. Elucidate the between-person relationships between smartphone food and beverage screenomes and dietary intake. we will examine how differences in digital exposures to food and beverage screenome features are associated with differences in dietary consumption. Aim 3. Elucidate the within-person relationships between changes in smartphone food and beverage screenomes and changes in dietary intakes. Leveraging natural experiments embedded in the screenome data. This study will provide the first comprehensive description of the food and beverage environment that adolescents experience on their smartphones and represents a true paradigm shift in studying media impacts on adolescents’ eating behaviors. The results of this study will identify novel intervention targets and opportunities for smartphone-based precision nutrition interventions and evidence-based policies to improve adolescents’ health.