Validation of Web-based Multimedia Dietary Assessment Tools

在流行病学研究中，越来越需要低成本和准确的方法来测量饮食摄入量和体力活动。该提案要求资金来检验两种新的饮食评估工具的准确性，即计算机辅助自访饮食史（CASI-DH），它是根据饮食史的优势建模的，是最强大的饮食评估方法之一，也是全自动多媒体24小时回忆：DIETDAY。CASI-DH是一种基于网络的自我访谈方法，以膳食音频和食物图片为基础；估算营养和食物摄入量；有一个广泛的组成部分来评估膳食补充剂的使用并提供反馈以帮助人们养成更健康的饮食习惯它与食物频率问卷在许多重要方面的不同之处在于它是完全定量的，包括数千种食物，以餐为基础，并且不截断食物或消费频率。本文提出的验证研究的目的是通过比较通过CASI-DH获得的自我报告的营养和食物摄入量，并使用DIETDA客观验证150名非洲裔美国人和150名高加索成年人样本中的生物标志物，来测试这些新工具捕获通常死亡的准确性。具体而言，我们的目标是检查这两种工具在营养摄入（总能量、蛋白质和钾）方面的有效性。蔬菜和水果的补充使用用双标水为总能量24小时尿氮为蛋白质；尿钾为膳食钾；而血液中营养成分（类胡萝卜素和生育酚）多用于水果、蔬菜的营养补充。一些次要目标也将被追求，包括验证两种身体活动问卷和两种不同的DLW加速度测量方法。为了研究CASI-DH、DIETDAY和DLW的可重复性，将对100人进行重复测量，间隔6个月。由于成本低，系统语言独立，以及依赖图像进行准确交流，CASI-DH和DIETDAY为各种人群的流行病学研究提供了独特的机会，可以评估复杂的饮食暴露。CASI-DH或DIETDAY的成功验证将代表营养流行病学方法学上的重要进步。这项研究也将有助于我们对这些饮食和活动评估工具在多种族人群中的信心。

There is an increasing demand for low cost and accurate methods to measure dietary intake and physica activity in epidemiologic studies. This proposal requests funds to examine the precision of two new dietar assessment tool, the Computer-Assisted Self-Interview Diet History (CASI-DH), which is modeled after th strengths of the diet history, one of the strongest dietary assessment approaches and ana fully automate multimedia 24 hour recall: DIETDAY. The CASI-DH is a web-based, self-interview approach that is meal- audio-, and food picture-based; generates nutrient and food intake estimates; has an extensive componen to assess dietary supplement use and provides feedback to help people adopt more healthful dietary habits It differs in many significant ways from food frequency questionnaires in that it is fully quantitative, include thousands of foods, is meal-based, and does not truncate foods or frequencies of consumption. Th objective of the validation study proposed here is to test how accurately these new tools capture usual die by comparing self-reported nutrient and food intakes obtained through the CASI-DH and using the DIETDA to objective validation biomarkers in a sample of 150 African American and 150 Caucasian adults Specifically, we aim to examine the validity of both instruments for intakes of nutrients (total energy, protein and potassium), vegetables and fruits and supplement use by using doubly labeled water for total energy 24-hour urinary nitrogen for protein; urinary potassium for dietary potassium; and blood levels of nutrient (carotenoids and tocopherols) for fruits, vegetables, and nutritional supplement use. A number of secondar aims will also be pursued, including validation of two physical activity questionnaires and two differen accelerometry approaches to DLW. To study the reproducibility of the CASI-DH, DIETDAY and DLW, repea measures will be conducted on a subset of 100 persons 6 months apart. Due to its low cost, the languag independence of the system, and the reliance on images for accurate communication, the CASI-DH an DIETDAY present unique opportunities for epidemiologic research in various populations for assessment o complex dietary exposures. Successful validation of either the CASI-DH or the DIETDAY will represen important methodological advances in nutritional epidemiology.Theepidemiology. The study will als contribute to our confidence in these dietary and activity assessment instruments in multiracial populations.