Treatment of the disease of obesity in patients with type 1 diabetes with tirzepatide: a protocol for a randomised controlled trial in a single-centre setting.

INTRODUCTION: Medication for the disease of obesity has improved, and clinical trials based on natural gut hormones such as tirzepatide, showed only mild side effects and ~22% weight loss maintenance. However, patients with type 2 diabetes only lose 15% bodyweight with tirzepatide while tolerating the medications very well, but little is known in patients with the disease of obesity who also have type 1 diabetes, especially regarding safety of the medications. Tirzepatide's licence in the Gulf countries and Europe for obesity does not exclude patients with obesity and type 1 diabetes, unlike the USA. In Kuwait, more than a quarter of patients with type 1 diabetes also have the disease of obesity. Tirzepatide is not approved for glycaemic control in patients with type 1 diabetes, because it is unlikely to make a difference. Because tirzepatide is approved for the treatment of obesity in patients who also have type 1 diabetes we can now test how effective treatments for obesity such as tirzepatide are for patients with obesity and type 1 diabetes. Concerns regarding the safety of the medication in type 1 diabetes can also be addressed thus addressing an important knowledge gap. METHODS AND ANALYSIS: This will be a randomised double blind controlled trial of 60 patients with obesity and type 1 diabetes to test usual care with or without maximum tolerable dose of tirzepatide to achieve weight loss. We will investigate the safety of the medications in patients with obesity and type 1 diabetes to address important knowledge gap which can change clinical practice. ETHICS AND DISSEMINATION: The study has received ethical approval from the Dasman Diabetes Institute Ethical Review Committee (HR-RA-2025-03) and is registered at ClinicalTrials.gov (NCT07096908). Written informed consent will be obtained from all participants, with no financial compensation provided. Data will be reported in accordance with Consolidated Standards of Reporting Trials guidelines, ensuring participant anonymity. Findings will be disseminated through peer-reviewed publications and presentations at national and international conferences. TRIAL REGISTRATION NUMBER: NCT07096908.