Vey Low-Energy Ketogenic Therapy in Adults With Type 1 Diabetes and Obesity on Intensive Insulin Therapy Using Advanded Hybrid Closed Loop System

Overweight and obesity are frequent in adults with type 1 diabetes (T1D), with prevalence exceeding 50% in recent studies. Excess weight in T1D is associated with higher cardiometabolic risk and therapeutic challenges, while effective and safe weight management strategies are still limited. This single-center, single-arm feasibility study will evaluate the efficacy and safety of a Very Low-Energy Ketogenic Therapy (VLEKT; 600-800 kcal/day) in adults with T1D and obesity treated with Advanced Hybrid Closed Loop (AHCL) insulin delivery systems. Participants will follow a structured 4-week program with commercial very-low-carbohydrate, high-protein meal replacements, under close medical supervision. The primary endpoint is change in body weight at 4 weeks. Secondary outcomes include body composition, muscle strength, glucose metrics, insulin requirements, biochemical parameters, and patient-reported outcomes. Safety will be assessed through hypoglycemia incidence, ketone monitoring, and occurrence of diabetic ketoacidosis (DKA). The study will enroll 14 participants. It is expected that VLEKT will achieve \~5% weight loss within one month while maintaining glycemic safety under AHCL technology.

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