AUSTRALIAN JOURNAL OF BIOMEDICAL RESEARCH

Keyword: Adolescents

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Case Report
Crossing of Autoimmunity and Metabolic Dysfunction: A Case of Double Diabetes in an Algerian Adolescent
Australian Journal of Biomedical Research, 2(2), 2026, aubm020, https://doi.org/10.63946/aubiomed/18515
ABSTRACT: Background: The rising prevalence of childhood obesity and sedentary lifestyles has blurred the traditional distinction between type 1 and type 2 diabetes. Double diabetes represents the coexistence of autoimmune β-cell destruction and insulin resistance, posing diagnostic and therapeutic challenges, particularly in adolescents.
Case presentation: We report the case of a 17-year-old obese female with a three-year history of type 1 diabetes who developed marked insulin resistance and metabolic syndrome features. Despite high insulin requirements (1.6 U/kg/day), glycemic control remained poor (HbA1c 12.8%). Clinical examination revealed obesity (BMI 32.4 kg/m²) and acanthosis nigricans. Laboratory evaluation showed preserved C-peptide secretion, dyslipidemia, elevated leptin and homocysteine levels, and positivity for anti-GAD65 and islet cell antibodies, supporting the diagnosis of double diabetes.
Management and Outcomes: A combined therapeutic strategy including optimization of basal-bolus insulin therapy, adjunctive metformin, structured nutritional intervention, and regular physical activity was implemented. Six months later, and at the stage of her transition, HbA1c decreased to 7.8%, body weight was reduced by 8 kg, daily insulin requirements decreased by 35%, and lipid parameters improved significantly.
Conclusion: This case highlights the importance of early recognition of double diabetes in youth and demonstrates that integrated metabolic and autoimmune-targeted management can significantly improve glycemic control and cardiometabolic risk.