Dietary assessment provides valuable information in examining adolescent health. Conventional food recording is problematic for adolescents but use of technology elicits interest. We describe in this report a food record method using personal mobile phones . Subjects were 47 females and 23 males ages 12-18 who own mobile phones with camera. Each was given a fiducial marker (FM) with their identification number and trained on the protocol for taking before-and-after pictures of their meal with the FM. Subjects were randomly assigned 6 days to report within 3 months. Reminders were sent a week and the night before reporting day to prepare phones and FM. During reporting , subjects instantaneously sent pictures and text messages of foods and amounts eaten every meal to a designated email address. Research dietitians reviewed the pictures and messages the following day, resolved reported intake issues with the subject via text messaging , and collated the pictures and texts as food records. All food picture sizes were standardized relative to a specific FM length to aid in verifying amounts eaten. Records were coded later. Reviewing, collating, and recording took 30-90 minutes/record. This novel method is suitably engaging and less burdensome to adolescents ; however, researchers may not find it more time-efficient or cost-effective than 24-hr diet recall by phone interview.