Study Overview: The U-TRANS study is looking into how eating less ultra-processed foods (UPFs) might help people who are at high risk of cancer. UPFs are foods that have been changed a lot from their original form, and eating them has been linked to health issues like obesity and cancer. The study uses the Open Food Facts app to help people learn more about their food choices. The WCRF score is a measure of how well someone follows healthy eating guidelines; a score of 5 or less means not following these guidelines well.

• **Duration:** The study lasts 12 weeks.
• **Participation:** Participants need a smartphone and must complete questionnaires.
• **Eligibility:** Must be over 18, at high risk of cancer, and speak French.

Participants will be split into two groups. One group gets simple nutrition advice, and the other uses the app to help make better food choices. Researchers will see if using the app helps people eat fewer UPFs and improve their diet quality.