Running marathons with type 1 diabetes can be safe, small study shows
New research to be presented at the Annual Meeting of the European Association for the Study of Diabetes (EASD) in Milan, Italy, from Sept. 28–Oct. 2 shows that, with the use of continuous glucose monitoring (CGM) devices, people with type 1 diabetes can complete a marathon safely and achieve finishing times similar to runners without diabetes.
A small study presented at the European Association for the Study of Diabetes (EASD) conference in Milan shows that people with type 1 diabetes can safely complete a marathon with the aid of continuous glucose monitoring (CGM) technology. The research, led by Michał Kulecki, Dr. Andrzej Gawrecki and colleagues from Poznan University of Medical Sciences and Raszeja City Hospital in Poland, monitored glucose levels, carbohydrate intake and CGM accuracy during the 2025 Poznań Marathon.
The study included 20 amateur runners - 10 with type 1 diabetes (T1D) and 10 without diabetes. Researchers adjusted insulin doses and target glucose levels for the T1D participants. Despite differences in CGM accuracy during the race, all T1D participants finished the marathon with performance comparable to their non-diabetic counterparts.
The study emphasizes the importance of individualized blood sugar management strategies and regular glucose checks, especially when CGM readings diverge from how participants feel.
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