Kong Kaimeng, Zhang Lulu, Huang Lisu, Tao Yexuan
Department of Clinical Nutrition, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
Shanghai Key Laboratory of Children Gastroenterology and Nutrition, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
Asia Pac J Clin Nutr. 2017 May;26(3):396-401. doi: 10.6133/apjcn.042016.05.
Image-assisted dietary assessment methods are frequently used to record individual eating habits. This study tested the validity of a smartphone-based photographic food recording approach by comparing the results obtained with those of a weighed food record. We also assessed the practicality of the method by using it to measure the energy and nutrient intake of college students.
The experiment was implemented in two phases, each lasting 2 weeks. In the first phase, a labelled menu and a photograph database were constructed. The energy and nutrient content of 31 randomly selected dishes in three different portion sizes were then estimated by the photograph-based method and compared with a weighed food record. In the second phase, we combined the smartphone-based photographic method with the WeChat smartphone application and applied this to 120 randomly selected participants to record their energy and nutrient intake.
The Pearson correlation coefficients for energy, protein, fat, and carbohydrate content between the weighed and the photographic food record were 0.997, 0.936, 0.996, and 0.999, respectively. Bland-Altman plots showed good agreement between the two methods. The estimated protein, fat, and carbohydrate intake by participants was in accordance with values in the Chinese Residents' Nutrition and Chronic Disease report (2015). Participants expressed satisfaction with the new approach and the compliance rate was 97.5%.
The smartphone-based photographic dietary assessment method combined with the WeChat instant messaging application was effective and practical for use by young people.
图像辅助饮食评估方法常用于记录个人饮食习惯。本研究通过比较基于智能手机的食物拍照记录法与称重食物记录法的结果，检验了该方法的有效性。我们还通过使用该方法测量大学生的能量和营养摄入量，评估了其实用性。
实验分两个阶段进行，每个阶段持续2周。在第一阶段，构建了一个带有标签的菜单和一个照片数据库。然后，通过基于照片的方法估算了31种随机选择的不同分量菜肴的能量和营养成分，并与称重食物记录法进行比较。在第二阶段，我们将基于智能手机的拍照方法与微信智能手机应用程序相结合，并将其应用于120名随机选择的参与者，以记录他们的能量和营养摄入量。
称重食物记录法与拍照食物记录法之间能量、蛋白质、脂肪和碳水化合物含量的Pearson相关系数分别为0.997、0.936、0.996和0.999。Bland-Altman图显示两种方法之间具有良好的一致性。参与者估计的蛋白质、脂肪和碳水化合物摄入量与《中国居民营养与慢性病状况报告（2015年）》中的数值一致。参与者对新方法表示满意，依从率为97.5%。
基于智能手机的拍照饮食评估方法与微信即时通讯应用程序相结合，对年轻人来说是有效且实用的。
