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

The goal of this pilot trial is to compare three meal strategies using an ultra-rapid insulin (Lyumjev) and an automated insulin delivery system. The meal strategies to be investigated are carbohydrate counting, qualitative meal announcement (e.g., low-carb meal), and meal detection. The investigators are doing this research to evaluate if carbohydrate counting can be simplified in patients with type 1 diabetes. Participants will test each meal strategy in random order, and each meal strategy will be 21 days long. For the duration of each meal strategy, participants will use an automated insulin delivery system or \"artificial pancreas\" with an ultra-rapid insulin called Lyumjev.