Greater Kidney Complications in Patients Diagnosed with Type 2 Diabetes Before 40: Study Finds
China: Young adults diagnosed with type 2 diabetes mellitus (T2DM) face a substantially greater risk of kidney-related complications compared to their non-diabetic peers, two large-scale cohort studies from the United Kingdom and Hong Kong have shown.
The analysis revealed that individuals diagnosed between ages 18 and 39 had nearly double the risk of chronic kidney disease (CKD) and more than fourfold higher risks of renal function decline and end-stage renal disease (ESRD). These risks decreased steadily with advancing age at diabetes onset, underscoring the importance of early detection, vigilant monitoring, and renal-protective care in younger patients.
The study, published in Diabetes, Obesity and Metabolism, was conducted by Boyuan Wang, MPH, and colleagues from the Department of Family Medicine and Primary Care at the University of Hong Kong. With rising rates of early-onset T2DM worldwide, the researchers sought to quantify how the age of onset influences the likelihood of developing kidney complications over time.
The analysis included two retrospective cohorts drawn from electronic health records: 124,610 patients with newly diagnosed T2DM in the UK and 183,114 in Hong Kong, alongside comparison groups of nearly five million and 3.3 million age-matched non-diabetic individuals, respectively. Participants were grouped by age at diagnosis—18–39, 40–49, 50–59, 60–69, 70–79, and 80 years or older—and followed for up to 11.6 years in the UK and 9.7 years in Hong Kong.
Key Findings from the UK and Hong Kong Cohorts
- Type 2 diabetes mellitus (T2DM) was consistently linked with higher risks of chronic kidney disease (CKD), renal decline, and end-stage renal disease (ESRD) across all age groups.
- The level of risk varied depending on the age at diagnosis.
- In the UK cohort, individuals diagnosed with T2DM between ages 18–39 had hazard ratios of 1.87 for CKD, 4.87 for renal decline, and 4.49 for ESRD compared with non-diabetic peers.
- For those diagnosed at age 80 or older, the risks were lower but still significant, with hazard ratios of 1.26 for CKD, 1.66 for renal decline, and 1.48 for ESRD.
- The Hong Kong cohort showed a similar pattern, confirming that the earlier onset of T2DM was strongly associated with greater vulnerability to kidney complications.
The authors emphasized that these results highlight the disproportionate burden faced by younger adults with T2DM, who live longer with the disease and are more exposed to its cumulative complications. The study points to an urgent need for strategies aimed at prevention, early diagnosis, and aggressive management of kidney health in this population.
Still, the researchers noted that lifestyle, genetic, and healthcare system differences may influence risk patterns, and further work is needed to explore these aspects.
"Early-onset type 2 diabetes carries a markedly higher risk of kidney complications, posing a significant threat to long-term health and quality of life. Preventing diabetes at a young age, coupled with early intervention and consistent kidney monitoring, could be crucial steps in reducing the burden of diabetes-related renal disease worldwide," the authors concluded.
Reference:
Wang B, Liu KSN, Mak IL, Choi EPH, Lam CLK, Wan EYF. Impact of onset age of type 2 diabetes mellitus on risk of renal complications compared to age-matched non-diabetic patients: Two cohort studies in the United Kingdom and Hong Kong. Diabetes Obes Metab. 2025 Sep 1. doi: 10.1111/dom.70061. Epub ahead of print. PMID: 40888256.
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