Trajectories in Insulin Sensitivity Across MEnstrual cycleS in Women With Type 1 Diabetes

Who May Qualify: - Female sex - Between 18 and 40 years at inclusion - Menarche at least one year prior to study inclusion - Regular menstrual cycle (at least one menstrual cycle in the last 40 days) - Average menstrual cycle length between 21 and 38 days - Difference in length between consecutive menstrual cycles of at most 7 days - Living with type 1 diabetes or latent autoimmune diabetes in adults (LADA) for at least one year - Actively using an AID system for their diabetes management at least six months prior to study inclusion Who Should NOT Join This Trial: - Regular hormonal intake (e.g. corticosteroids), except: insulin, stable thyroid substitution, and hormonal contraception - Pregnancy until two months postpartum (ongoing or planned) - Current breastfeeding (including pumping), as well as two months following complete cessation of breastfeeding and pumping - Known Polycystic Ovary Syndrome (PCOS) - Intake of glucocorticoid medication, agents affecting gastric emptying, oral anti-diabetic agents (Metformin) or SGLT-2 inhibitors or GLP-1-analogs - Individuals with work patterns involving frequent shifts between night and day work (e.g., alternating night and day shifts on a weekly or similar basis). - Participation in an interventional study within two months preceding and during the present study Always talk to your doctor about whether this trial is right for you.