Participants will get feedback from the application as to whether they may have had a potential gluten exposure or that their food that they inputted in may have gluten in it. The investigators and research team will counsel patients on the possibility of the application occasionally not being able to accurately always identify gluten-free foods during the informed consent process, and it will be made clear that the families should be reading and understanding the gluten-free labels independently of the application as well(as it is the current clinical standard of care at BCH). The investigators and research team will also provide a reminder when starting the application, that while the application tries to be 100% updated, if families are concerned about gluten exposure, they should still independently read the labels as well.

This group will still use the MyMedDiary application to input 3-day dietary recall, however there will not be feedback on whether they may have had a potential gluten exposure or if the food that they inputted in may have gluten in it.

myMedDiary is a HIPAA-compliant, researcher-configurable mobile and web-based application designed for real-time dietary, symptom and lifestyle data collection. It was utilized to collect dietary data in an IRB-approved study at Seattle Children's Hospital evaluating the dietary cost burden of gluten-free foods in pediatric patients with celiac disease (submitted for publication). The application enables participants to log meals using barcode scanning, keyword search, and manual entry, including recipe-level data. The backend system stores encrypted data securely in Microsoft Azure, and dietary entries are automatically converted to nutrient data using a standardized reference system. Researchers access de-identified participant data and analytics through a secure online dashboard. The system supports multicenter trials.

Estimates of the dietary relative contributions of each NOVA groups(this is an ultraprocessing food score system from 1-4) will be obtained by MyMedDiary with parallel paper based manual recall and manual dietary classification at 4 different time point (at initial entry, 2-month, 4-month and 6-month). The primary outcome will be differences in calculating mean contributions of ultra-processed foods at 6 month.

Estimates of the dietary relative contributions of NOVA groups will be obtained by MyMedDiary with parallel paper based manual recall and manual dietary classification at 4 different time point (at initial entry/diagnostic endoscopy, 2-month, 4-month and 6-month).