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

Inclusion Criteria: * Clinical diagnosis of type 1 diabetes for at least 12 months. The diagnosis of type 1 diabetes is based on the investigator's judgment per local and international guideline criteria. * Insulin pump use for at least 3 months. * Individuals of childbearing potential must agree to use a highly effective method of birth control. * Willing to switch to Lyumjev insulin for the duration of the study. Exclusion Criteria: * Use of oral antihyperglycemic agents within 2 weeks of admission (SGLT2i, metformin…); 1 month for GLP1-RA. * Use of glucocorticoids (except low, stable doses and inhaled steroids). * Use of hydroxyurea. * Planned or ongoing pregnancy. * Breastfeeding. * Diabetic ketoacidosis and/or severe hypoglycemia episode (defined as requiring the assistance of another person, due to altered consciousness, to administer carbohydrates, glucagon, or other resuscitative actions) within one month of admission. * Clinically significant retinopathy, nephropathy, or neuropathy as judged by the investigator. * Recent (\<6 months) acute macrovascular event e.g., acute coronary syndrome or cardiac surgery. * Known hypersensitivity to the study drug or its excipients. * Other serious medical illness likely to interfere with study participation or with the ability to complete the trial, as judged by the investigator.