Automated insulin delivery systems, also known as closed-loop systems, have shown to improve TIR, TAR, and TBR compared with insulin pump and CGM systems that cannot automatically dose insulin. Only few studies have described long-term use of AID systems over several years. Real-world studies suggest that the beneficial effects of AID systems on glycemic outcomes are sustained over time; however, a modest increase in body weight has been observed in some users, raising concerns about the metabolic trade-offs of improved glycemia. We aim to explore wether the improvements in glycemic outcomes and treatment satisfaction achieved with AID systems remain stable over multiple years, and secondly, if long-term treatment with AID systems may be associated with an increase in body weight.