A Trial to Compare Automated Lyumjev Delivery With Carbohydrate Counting, Qualitative Meal-size Estimation, and Meal Detection in Type 1 Diabetes

This trial compares three approaches to mealtime insulin dosing in people with type 1 diabetes using an automated insulin delivery system: traditional carbohydrate counting, a simpler meal-size estimation approach, and fully automated meal detection — to see which works best. **You may be eligible if...** - You have had type 1 diabetes for at least 12 months - You have been using an insulin pump for at least 3 months - You are willing to switch to a different fast-acting insulin (Lyumjev) for the duration of the study - You agree to use effective contraception if of childbearing potential **You may NOT be eligible if...** - You are currently taking oral diabetes medications (SGLT2 inhibitors, metformin, GLP-1 drugs) - You are pregnant or breastfeeding - You have had DKA or a severe hypoglycemic episode within the past month - You have significant eye, kidney, or nerve complications from diabetes as judged by your doctor - You have had a recent heart attack or cardiac surgery within 6 months Talk to your doctor to see if this trial is right for you.