Validation of Web-based Multimedia Dietary Assessment Tools

对低成本和准确的方法来测量膳食摄入和身体健康的需求日益增加。 在流行病学研究中。这项提案要求拨款，以检查两个新的饮食的精确性， 评估工具，计算机辅助自我采访饮食史（CASI-DH），这是仿照 饮食史的优势，最强大的饮食评估方法之一，全自动化的ana 多媒体24小时回忆：节食。CASI-DH是一种基于网络的自我访谈方法， 基于音频和食物图片;生成营养和食物摄入量估计;具有广泛的组成部分 评估膳食补充剂的使用情况，并提供反馈，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不同，因为它是完全定量的，包括 成千上万的食物，是以膳食为基础的，不削减食物或消费频率。的 这里提出的验证研究的目的是测试这些新工具捕获日常饮食的准确性 通过比较通过CASI-DH和使用DIETDAY获得的自我报告的营养素和食物摄入量， 在150名非洲裔美国人和150名白人成年人的样本中进行客观验证生物标志物。 具体来说，我们的目标是检查这两种工具的营养素摄入量（总能量，蛋白质， 和钾）、蔬菜和水果以及通过使用双标记水的总能量补充使用; 24-小时尿氮蛋白;尿钾饮食钾;和血液营养水平 （类胡萝卜素和生育酚）用于水果、蔬菜和营养补充剂。多个二级 还将追求的目标，包括验证两个身体活动问卷和两个不同的 加速度测量法接近DLW。为了研究CASI-DH、DIETDAY和DLW的重现性，重复 每隔6个月对100人的子集进行测量。由于成本低，语言 系统的独立性，以及对图像准确通信的依赖，CASI-DH和 饮食日为在不同人群中进行流行病学研究提供了独特的机会， 复杂的饮食接触。成功验证CASI-DH或DIETDAY将代表 营养流行病学的重要方法学进展。该研究还将 有助于我们在多种族人群中对这些饮食和活动评估工具的信心。

There is an increasing demand for low cost and accurate methods to measure dietary intake and physical activity in epidemiologic studies. This proposal requests funds to examine the precision of two new dietary assessment tool, the Computer-Assisted Self-Interview Diet History (CASI-DH), which is modeled after the strengths of the diet history, one of the strongest dietary assessment approaches and ana fully automated 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 component 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, includes thousands of foods, is meal-based, and does not truncate foods or frequencies of consumption. The objective of the validation study proposed here is to test how accurately these new tools capture usual diet by comparing self-reported nutrient and food intakes obtained through the CASI-DH and using the DIETDAY 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 nutrients (carotenoids and tocopherols) for fruits, vegetables, and nutritional supplement use. A number of secondary aims will also be pursued, including validation of two physical activity questionnaires and two different accelerometry approaches to DLW. To study the reproducibility of the CASI-DH, DIETDAY and DLW, repeat measures will be conducted on a subset of 100 persons 6 months apart. Due to its low cost, the language independence of the system, and the reliance on images for accurate communication, the CASI-DH and DIETDAY present unique opportunities for epidemiologic research in various populations for assessment of complex dietary exposures. Successful validation of either the CASI-DH or the DIETDAY will represent important methodological advances in nutritional epidemiology.Theepidemiology. The study will also contribute to our confidence in these dietary and activity assessment instruments in multiracial populations.