Inclusion Criteria:  Signed and dated informed consent form Females and males ≥ 18 years old Diagnosis of type 1 diabetes of ≥ 12 months based on the clinical investigator's judgement Undergoing MDI therapy A self-reported diet that consists of at least 3 high-fat meals per week or participation in exercise for at least 30 minutes, two times per week  Exclusion Criteria:  Current use of any non-insulin antihyperglycemic medication (SGLT2 inhibitors, GLP 1 receptor agonists, metformin…) Current use of glucocorticoid medication, except inhaled and/or at low stable doses Pregnancy Use of isophane insulin (NPH) or intermediate-acting insulin Significant clinical nephropathy, neuropathy, retinopathy as per the clinical investigator's judgement Acute macrovascular event (ex: acute coronary syndrome or cardiac surgery) within 6 months of admission Severe diabetes ketoacidosis and/or hypoglycemia within one month of admission Other severe medical illness that the clinical investigator considers may interfere with participation in or completion of the study An inability or unwillingness to comply with study procedures as per the clinical investigator's judgement