Type 1 and Type 2 Diabetes May Affect Men and Women Differently, Landmark Study Finds

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A major new study from Uppsala University, Sweden, presented at the European Association for the Study of Diabetes (EASD) Annual Meeting in Vienna (August 2025), reveals that Type 1 and Type 2 diabetes pose distinctly different cardiovascular and mortality risks for men and women. This large-scale analysis, involving more than 400,000 adults, is generating attention among healthcare professionals and the public for its potentially practice-changing implications on diabetes management across genders.

Key Findings from the Uppsala University Study

The study included 404,026 patients with diabetes aged 18 to 84, subdivided into 38,351 with Type 1 diabetes (T1D) and 365,675 with Type 2 diabetes (T2D); participants comprised 233,858 men and 170,168 women.
For men under age 50, those with T2D faced a 51% higher risk of cardiovascular disease (CVD), were 2.4 times likelier to have heart attacks, and 2.2 times more likely to develop heart failure compared to those with T1D.
For women of all ages, T1D was associated with worse outcomes than T2D: cardiovascular mortality was 34% lower and all-cause mortality 19% lower among women with T2D vs T1D, especially in those over 50.

Expert Commentary

Dr. Vagia Patsoukaki of Uppsala University explained, “Women with Type 1 diabetes often develop the disease at a young age, so they live with it longer, which increases their lifetime risk of heart and blood vessel problems. They may also lose some of the natural protection women usually have against heart disease, and often receive less aggressive treatment for cardiovascular disease than men.”

In contrast, “Younger men with type 2 diabetes tend to have more risk factors like obesity, high blood pressure, and unhealthy lifestyles. Their diabetes is often more aggressive, and they may be diagnosed later, making their early outcomes worse.”

Dr. Alexandra Kautzky-Willer, Professor of Endocrinology (not involved in the Uppsala study), notes, “Although more men currently live with diabetes globally, women—especially young women—face greater risks of cardiovascular complications when diagnosed. This supports the call for sex-specific prevention and management strategies.”

Context and Background

Diabetes is a chronic metabolic disorder affecting the body’s ability to regulate blood sugar. Type 1 diabetes tends to begin in childhood or adolescence, resulting from autoimmune destruction of insulin-producing cells. Type 2 diabetes, far more common, generally develops in adulthood and is linked to lifestyle factors such as obesity and inactivity.

Previous research shows that both forms of diabetes heighten the risk of cardiovascular disease and premature death, but mounting evidence is clarifying sex-specific risk profiles. For instance, women with diabetes often have poorer prognoses after cardiac events and may be less likely than men to receive guideline-recommended screening or aggressive treatment for heart risk factors like cholesterol and blood pressure.

Implications for Public Health

The study’s findings suggest an urgent need to tailor diabetes screening, prevention, and treatment strategies not only by diabetes type but also by sex. Health professionals may need to exercise increased vigilance for heart disease in young men with T2D and for cardiovascular risks in women with T1D.

For the public, key takeaways include:

Early diagnosis and proactive management of diabetes, regardless of type, lowers the risk of life-threatening heart and blood vessel complications.
Men under 50 with T2D should prioritize blood pressure, cholesterol, and weight management, as their risk of CVD is especially elevated.
Women—especially those diagnosed in youth with T1D—should work with their providers to mitigate long-term cardiovascular risks, including more frequent screening and aggressive risk reduction.

Limitations and Counterarguments

While the study is one of the largest to date and is based on real-world patient data, certain limitations apply:

The results are observational and do not establish causality between diabetes type, sex, and outcomes.
Other factors—such as socioeconomic status, ethnicity, and access to health care—could influence risk profiles but were not fully accounted for.
The study’s findings warrant further confirmation in populations outside Sweden and in younger age groups.

Some previous studies suggest that women may actually face higher relative cardiovascular risks when diagnosed with diabetes, especially if guideline-recommended care is less aggressive or less accessible. This underlines the importance of equitable treatment and ongoing research.

Practical Implications for Daily Health Decisions

Know your risk: Awareness of personal diabetes type and associated cardiovascular risks is crucial.
Don’t skip screening: Regular heart checks, including cholesterol and blood pressure testing, are essential for all people with diabetes.
Treatment matters: Work with practitioners to ensure aggressive, guideline-based management of blood sugar and cardiovascular risk factors—especially if you are a woman with T1D or a man with T2D under age 50.
Lifestyle counts: Healthy diet, regular exercise, maintaining a healthy weight, and avoiding tobacco use remain cornerstones for reducing complications.

Medical Disclaimer

Medical Disclaimer: This article is for informational purposes only and should not be considered medical advice. Always consult with qualified healthcare professionals before making any health-related decisions or changes to your treatment plan. The information presented here is based on current research and expert opinions, which may evolve as new evidence emerges.