Young-Onset Type 2 Diabetes in Germany Linked to Socioeconomic and Migration Disparities

While type 2 diabetes is traditionally considered a condition that primarily develops later in life, a worrying recent trend shows a sharp rise in individuals developing the disease between the ages of 20 and 45. Onset at such a young age places a heavy burden on health since the disease carries severe consequences, including a faster decline in insulin-producing beta cells and earlier onset of complications like kidney disease, retinopathy, and cardiovascular events. Furthermore, it can lead to substantial productivity loss during prime working years and mental health issues.

"We wanted to know whether young-onset type 2 diabetes is unequally distributed across various social groups in Germany," says Dr. Justine Tanoey, researcher at BIPS and first author of the study. "The fact that the associations with education, income, and lifestyle behaviors into account was the key finding for us."

The NAKO is a population-based study involving approximately 205,000 participants. The baseline assessment took place between 2014 and 2019 at 18 study centers across Germany. For the current analysis, the research team compared 808 adults aged 20-45 who already had type 2 diabetes to a matched comparison group of 4,035 participants without diabetes, enabling detailed assessment of the role of socioeconomic and migration-related factors.

Core findings: education, income and migration background

Social position was clearly reflected in the data. Young adults living below the at-risk-of-poverty threshold (<60% of median household income) were considerably more likely to be in the young-onset diabetes group, as were those with lower educational attainment. Unemployment and manual or lower-skilled occupations were likewise more frequent among participants with young-onset diabetes than among those without, compared with employed participants and with salaried employees, professionals, and managers respectively. First-generation immigrants - people who had themselves migrated to Germany - were also more frequently affected, whereas no clear association emerged for second-generation immigrants, whose parents had immigrated but who were born in Germany themselves. The team also examined broad regions of origin, but differences between them should be interpreted cautiously because some groups were small.

All associations were estimated as odds ratios, which in a study of this design describe the direction and relative strength of an association but should not be read as a directly comparable difference in how common diabetes is.

The social gradient in young-onset diabetes was concentrated among participants with overweight or obesity (body mass index >=25), indicating that socioeconomic disadvantage is linked to metabolic health largely via pathways involving excess body weight. Among those with young-onset diabetes, 72% were overweight or had obesity, compared with 46% in the comparison group. This pattern plausibly reflects limited access to affordable healthy food, chronic socioeconomic stress, and fewer opportunities for physical activity. The authors stress that their cross-sectional design cannot determine whether social disadvantage precedes diabetes or vice versa, and they explicitly caution against causal interpretations. Nonetheless, the results are consistent with broader German and international evidence showing steeper type 2 diabetes gradients by education, income, and migration status.

Importantly, NAKO participation required official registration in Germany and sufficient German-language skills, likely underrepresenting the most marginalized groups (e.g., undocumented migrants, asylum seekers with minimal language access, people experiencing homelessness). The true burden of socially unequal young-onset diabetes may therefore be higher than reported.

Implications for public health policy

These findings expose critical gaps in current preventive strategies. Rather than viewing young-onset type 2 diabetes strictly through the lens of individual responsibility, the data point to a need for a systemic shift.

As Prof. Dr. Krasimira Aleksandrova, senior author and Deputy Head of the Department of Epidemiological Methods and Etiological Research at BIPS, emphasizes: "We can no longer trivialize young-onset type 2 diabetes as a mere consequence of individual health problems or poor lifestyle choices. Poverty and social background appear as important factors that affect a young person's metabolic health. Simply offering preventive advice may not be sufficient, we urgently need structural programs that target socioeconomically disadvantaged neighborhoods and guarantee better preventive care."

To operationalize these findings, public health frameworks must prioritize targeted, structural investments, such as:

- access to affordable healthy food options, safe recreational infrastructure, and integrated primary care in socioeconomically deprived neighborhoods;
- proactive screening, occupational health programs, and return-to-work support that accommodates chronic disease management, targeted at manual workers, the unemployed, and people outside the labor market;
- expanded multilingual prevention, culturally adapted counseling, and low-threshold access to diagnosis and treatment for first-generation migrants.

The study was published in the peer-reviewed journal Public Health. The authors report no conflicts of interest.

Original publication: Tanoey J et al.: "Socioeconomic and migration-related disparities in prevalent young-onset type 2 diabetes: Data from the German National Cohort (NAKO)." Public Health 258 (2026), Article 106425. DOI: 10.1016/j.puhe.2026.106425.

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The German National Cohort (NAKO) is a large, multicenter prospective cohort study that provides a unique resource for investigating social, environmental, and biological determinants of chronic disease in Germany.