The Colorado Diabetes Registry has tracked diabetes diagnoses among young people across the state continuously since 2002. Its surveillance system draws on multiple sources, including diagnostic codes, laboratory results and medication records, allowing researchers to identify new cases across healthcare systems rather than relying on a single clinic or hospital. The analysis included non-military, non-institutionalised residents of Colorado who were younger than 20 at diagnosis, with population estimates derived from census data. Incidence was calculated per 100,000 people under 20 for type 1 diabetes and per 100,000 people aged 10 to 19 for type 2 diabetes, because type 2 diabetes remains extremely uncommon in children younger than 10.

Across the 22-year study period, 8,094 children and adolescents were newly diagnosed with type 1 diabetes, while 1,560 young people aged 10 to 19 developed type 2 diabetes. Type 1 diabetes incidence rose modestly, from 25.07 cases per 100,000 in 2002 to 27.39 per 100,000 in 2023. Statistical modelling showed that the rate was relatively stable from 2002 through 2014, increasing by approximately 0.66 per cent annually, before accelerating to an annual increase of 2.62 per cent between 2015 and 2023. Although the later rise in type 1 diabetes is important, it was dwarfed by the change observed for type 2 diabetes.

Youth-onset type 2 diabetes increased by almost 10 times over the same period. The researchers calculated an average annual increase of 3.8 per cent across the entire study, but the trend was not uniform. Incidence grew by 2.92 per cent per year from 2002 to 2013 and by 4.72 per cent per year from 2014 to 2023. This pattern suggests that the change is not simply a historical shift that has now stabilised. Instead, the rate of new diagnoses has continued to climb, with the steepest growth occurring in recent years. The result is a rapidly expanding population of young people who may live with diabetes and its metabolic consequences for many decades.

Type 1 and type 2 diabetes arise through different biological mechanisms, although their clinical appearance can increasingly overlap in adolescents. Type 1 diabetes is an autoimmune disease in which the immune system attacks insulin-producing beta cells in the pancreas. The resulting insulin deficiency usually requires lifelong insulin replacement. Type 2 diabetes begins primarily with insulin resistance, a state in which muscle, liver and fat cells respond less effectively to insulin. The pancreas initially compensates by producing more insulin, but over time beta-cell function can deteriorate and blood glucose levels rise. Obesity, genetic susceptibility, puberty-related hormonal changes, inactivity and broader social and environmental conditions can all contribute to insulin resistance.

The growing prevalence of obesity among children and teenagers has made the distinction between the two forms of diabetes less obvious at diagnosis. A young person with a high body-mass index and elevated blood glucose may have type 2 diabetes, but body weight does not rule out type 1 diabetes, nor does age provide a reliable diagnosis. Some adolescents have features of both autoimmune diabetes and insulin resistance. Correct classification therefore requires laboratory testing, including diabetes-related autoantibodies that indicate an autoimmune attack and metabolic assessments that help identify insulin resistance and residual insulin production. The diagnosis has direct treatment implications: an adolescent with severe insulin deficiency may require immediate insulin, while treatment for type 2 diabetes may involve lifestyle support, glucose-lowering medication and, in some cases, insulin.

Dr Crume said that paediatric endocrinologists are now encountering type 2 diabetes in teenagers as a routine and growing part of clinical practice, but the condition may still be overlooked in primary care or within families because of its traditional association with middle age. Delayed recognition can allow high blood glucose to persist untreated, increasing the risk of acute metabolic problems and long-term tissue damage. The researchers argue that diagnostic pathways should ensure that every young person presenting with diabetes receives appropriate autoantibody and metabolic testing rather than being classified on appearance or assumptions. As the two conditions become harder to distinguish clinically, diagnostic precision becomes increasingly important for selecting effective therapy and counselling families.

The long-term outlook for youth-onset type 2 diabetes is particularly concerning because the disease can behave more aggressively in adolescents than in adults. Young people may experience a faster decline in pancreatic beta-cell function and greater difficulty maintaining glucose control. Complications affecting the kidneys, retina, peripheral nerves and cardiovascular system can emerge after only a few years, rather than after several decades of adult disease. A teenager diagnosed at 14 may therefore face a substantial burden of diabetes-related illness during early adulthood. Previous research has also linked youth-onset type 2 diabetes with reduced life expectancy, although individual outcomes vary according to treatment, access to care, socioeconomic conditions and the presence of other health problems.

The Colorado findings do not identify a single cause for the increase and cannot by themselves prove that rising obesity is responsible. They do, however, document a striking population-level shift and reinforce observations from the US-based SEARCH for Diabetes in Youth study, where type 2 diabetes has been increasing faster than type 1 diabetes. In some older adolescent groups, new type 2 diabetes cases have already surpassed new type 1 cases. The researchers say prevention must extend beyond asking an individual child to change behaviour. Family-wide access to nutritious food, water instead of sugar-sweetened drinks, regular physical activity, healthy school meals and safe neighbourhoods can influence risk, but these options are shaped by income, food availability and community infrastructure. The study is being presented as an oral conference presentation, and no full peer-reviewed paper has yet been published, so the findings should be interpreted as preliminary. Nevertheless, the accelerating trend highlights the need for continued surveillance, earlier recognition and stronger prevention efforts before diabetes becomes an even larger force shaping the health of the next generation.

Subject of Research: Youth-onset type 1 and type 2 diabetes incidence in Colorado, USA, from 2002 to 2023.

News Publication Date: 23-Aug-2026

Web References: https://www.thelancet.com/journals/landia/article/PIIS2213-8587(23)00025-6/abstract; https://drive.google.com/file/d/1CzxRavEluxmO3tmLe1r4Okktq4BcWhI-/view?usp=sharing

References: Oral Presentation 0049, Annual Meeting of the European Association for the Study of Diabetes, Milan, Italy, September 28–October 2.

Keywords: Type 2 diabetes, type 1 diabetes, youth-onset diabetes, adolescents, diabetes incidence, obesity, insulin resistance, autoimmune diabetes, Colorado, public health, diabetes prevention, paediatric endocrinology

Diabetes mellitus, primarily classified into type 1 and type 2, manifests through distinct physiopathological processes. In type 1 diabetes, which is predominantly an autoimmune disorder, the immune system targets insulin-producing beta cells in the pancreas, leading to absolute insulin deficiency. Conversely, type 2 diabetes is characterized by insulin resistance coupled with relative insulin deficiency. The overlapping symptoms complicate the diagnosis when children and adolescents present in ketosis or ketoacidosis, as both types can exhibit similar symptoms yet require fundamentally different management strategies.

In their study, the researchers meticulously analyzed clinical and biochemical markers in a cohort of children and adolescents diagnosed with diabetes at onset. This was no small task, as clinical nuances can often blur the lines between diabetes types, especially in the presence of severe metabolic disturbances like ketoacidosis. The ability to discern the underlying type of diabetes early on can significantly influence treatment protocols and long-term health outcomes, necessitating a thorough and systematic investigation into the markers that can aid in accurate classification.

The research underscored several key biochemical indicators that were observed in the patient cohorts. For instance, the presence of anti-GAD antibodies tends to signal type 1 diabetes, while certain lipodystrophic or obesity-related indicators may lean more towards a type 2 diagnosis. This critical differentiation is paramount, as type 1 diabetes requires immediate insulin therapy to prevent life-threatening complications, while type 2 diabetes may initially be managed with lifestyle changes or oral medications before progressing to insulin if necessary.

Researchers deployed rigorous statistical methodologies to analyze data spanning across a multitude of clinical settings. The retrospective nature of the study involved reviewing patient records, which allowed for a comprehensive approach to gather insights on the diversity of presentations and outcomes. The findings suggest that clinical judgment in conjunction with biochemical evaluations can significantly improve diagnostic accuracy, thereby enhancing the care delivered to this vulnerable population.

Furthermore, one of the fascinating dimensions highlighted by Liu and colleagues is the evolving nature of diabetes presentation in younger individuals. As the diabetes epidemic grows, particularly in the context of rising obesity rates among youth, there is a noted increase in atypical presentations of type 1 diabetes, exacerbating the diagnostic challenges faced by practitioners. The researchers posited that increased awareness and education among healthcare providers about these presentation shifts could facilitate earlier and more accurate diagnoses.

The study also touched upon the implications of misdiagnosis, which can lead to inappropriate treatment protocols that might worsen patient outcomes. For instance, children misdiagnosed with type 2 diabetes may face delays in receiving lifesaving insulin therapy, while those wrongly classified as type 1 diabetes may be subjected to unnecessary insulin treatments, potentially leading to adverse metabolic effects due to the misapplication of therapeutic regimens. These considerations urge the medical community to take a proactive approach in refining diagnostic processes and protocols.

Additionally, the emotional and psychological toll on young patients and their families cannot be understated. Misdiagnosis — especially in critical situations like diabetic ketoacidosis — can result in not only physical ramifications but also mental health challenges stemming from the uncertainty and stress associated with managing a chronic illness. Hence, distinguishing between diabetes types is not merely an academic exercise; it is a crucial element of comprehensive patient care, emphasizing the need for precise diagnostic criteria.

In summary, the retrospective analysis by Liu et al. brings to light the pressing need for enhanced diagnostic precision in pediatric diabetes. As the landscape of diabetes continues to evolve, the research equips clinicians with valuable insights that may influence future protocols and approaches to diagnosis and management. It underscores the importance of integrating biochemical markers into clinical evaluation to increase the likelihood of timely and appropriate intervention for young patients facing the challenges of diabetes.

By harnessing the findings of this pivotal study, healthcare systems can aspire to improve not only the accuracy of diabetes diagnoses among children and adolescents but also the overall treatment strategies that are ultimately designed to safeguard their long-term health and well-being. This highlights the importance of continuous research and development in the field of endocrinology, as it holds the key to transforming the lives of those affected by diabetes.

While the results of this analysis are promising, it also emphasizes that there is still much work to be done in clinical practice. Developing standardized protocols based on the identified markers could pave the way for more streamlined diagnostic processes. Moreover, it encourages an interdisciplinary approach, drawing in pediatricians, endocrinologists, dietitians, and mental health professionals to holistically address the multifaceted challenges of diabetes management in youth.

As the research community continues to delve into the complexities of diabetes, Liu et al.’s study serves as a crucial reminder of the often-overlooked population: children and adolescents. By shining a spotlight on their unique needs and the challenges they face at diagnosis, this research invites further exploration and innovation that could change the narrative of diabetes management for the next generation.

Researchers, healthcare providers, and policymakers alike should heed the findings of these analyses, considering their implications for practice and policy. The path forward will undoubtedly require commitment, collaboration, and compassion, ensuring that youth with diabetes receive the best possible care as they navigate their health journeys.

Subject of Research: Differentiating diabetes types in children and adolescents with ketosis or ketoacidosis.

Article Title: Differentiating diabetes type in children and adolescents with ketosis or ketoacidosis at onset: a retrospective analysis of clinical and biochemical markers.

Article References: Liu, H., Wang, Y., Wang, M. et al. Differentiating diabetes type in children and adolescents with ketosis or ketoacidosis at onset: a retrospective analysis of clinical and biochemical markers. BMC Endocr Disord 25, 258 (2025). https://doi.org/10.1186/s12902-025-02077-x

Image Credits: AI Generated

DOI: https://doi.org/10.1186/s12902-025-02077-x

Keywords: Diabetes type differentiation, children, adolescents, ketosis, ketoacidosis, clinical markers, biochemical markers, type 1 diabetes, type 2 diabetes.