The rapidly increasing incidence of type 2 diabetes and macrovascular and microvascular complications disproportionately affects younger age groups: A decade of evidence from an international federated database

Aims: To characterise recent trends in incidence and prevalence of type 2 diabetes (T2D) associated complications, and their relative impact across the lifespan. Methods: We conducted a retrospective cohort study using the TriNetX global federated database. Incidence and prevalence of T2D and associated complications: ischaemic heart disease (IHD), heart failure, cerebral infarction, neuropathy, nephropathy, and retinopathy were assessed between 2012 and 2023. Incidence odds ratios (IOR) were calculated by age group. 

Results: 7,918,666 individuals had T2D. The IOR (95 % CI), comparing individuals aged ≥ 85 years to < 35 years decreased for all complications from 2012 to 2023: IHD [IOR 6.82, (6.40, 7.26) to IOR 2.27 (2.17, 2.38)], heart failure [IOR 5.38, (5.03, 5.75) to IOR 1.80 (1.72, 1.89)], cerebral infarction [IOR 3.06, (2.76, 3.40) to IOR 1.45 (1.34, 1.57)], neuropathy [IOR 0.84, (0.74, 0.95) to IOR 0.47 (0.44, 0.49)], nephropathy [IOR 1.14, (1.03, 1.27) to IOR 0.90 (0.87, 0.94)] and retinopathy [IOR 0.56, (0.50, 0.63) to IOR 0.27 (0.25, 0.29)]. 

Conclusions: Rising rates of T2D associated complications in younger adults signal an emerging epidemic of early-onset comorbidity with substantial lifetime burden. These findings emphasise the urgent need for earlier detection, aggressive risk factor management, and targeted prevention strategies in younger populations.