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Technology-enhanced methods of dietary assessment may still face common limitations of self-report. This study aimed to assess foods and beverages omitted when both a 24 h recall and a smartphone app were used to assess dietary intake compared with camera images. For three consecutive days, young adults (18-30 years) wore an Autographer camera that took point-of-view images every 30 seconds. Over the same period, participants reported their diet in the app and completed daily 24 h recalls. Camera images were reviewed for food and beverages, then matched to the items reported in the 24 h recall and app. ANOVA (with post hoc analysis using Tukey Honest Significant Difference) and paired t -test were conducted. Discretionary snacks were frequently omitted by both methods ( p &lt; 0.001). Water was omitted more frequently in the app than in the camera images ( p &lt; 0.001) and 24 h recall ( p &lt; 0.001). Dairy and alternatives ( p = 0.001), sugar-based products ( p = 0.007), savoury sauces and condiments ( p &lt; 0.001), fats and oils ( p &lt; 0.001) and alcohol ( p = 0.002) were more frequently omitted in the app than in the 24 h recall. The use of traditional self-report methods of assessing diet remains problematic even with the addition of technology and finding new objective methods that are not intrusive and are of low burden to participants remains a challenge.

Using Wearable Cameras to Assess Foods and Beverages Omitted in 24 Hour Dietary Recalls and a Text Entry Food Record App