Causes & What We Know/September 8, 2026/2 min read

Clinical modifiers of the association between type 1 diabetes and dementia incidence.

INTRODUCTION: Type 1 diabetes mellitus (T1DM) increases dementia risk.

PubMed indexed literature

Evidence label explains the kind of source behind this article (for example peer-reviewed literature vs community video). It is not medical advice.

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Key takeaways

INTRODUCTION: Type 1 diabetes mellitus (T1DM) increases dementia risk.
Understanding clinical modifiers of that effect could inform prevention.
METHODS: We analyzed data from All of Us.

What the research looked at

INTRODUCTION: Type 1 diabetes mellitus (T1DM) increases dementia risk.

Understanding clinical modifiers of that effect could inform prevention.

METHODS: We analyzed data from All of Us.

Participants were aged ≥50 years with T1DM (n = 5,442) or no diabetes (n = 226,819).

What it reported

RESULTS: Among 232,261 participants (mean [SD] age 64.5 [9.0] years; 57.3% women), 2.3% had a T1DM diagnosis.

Among those without diabetes, each additional comorbidity corresponded to a dementia hazard ratio (HR) of 1.22 (95% CI: 1.19, 1.26).

The dementia HR among participants with both T1DM and depression, compared with having neither, was pronounced (HR: 5.47 [95% CI: 4.23, 7.08]) and consistent with the independent associations of T1DM alone (HR: 2.01 [95% CI:1.38, 2.92]) and depression alone (HR: 2.55 [95% CI: 2.22, 2.95]).

DISCUSSION: Individuals who have both T1DM and depression are at especially high risk for dementia.

What it means for the Type 1 community

This is pubmed indexed literature and is shared for information, not as medical advice. One study is a data point, not a verdict, so read it alongside the broader body of evidence and your own care team's guidance.

Evidence label

Source: Alzheimer's & dementia : the journal of the Alzheimer's Association. Evidence type: PubMed indexed literature. Type1Cure is an information and intelligence hub, not a medical advice service. This article summarizes published research and does not provide diagnosis, treatment, or personal medical guidance. Always talk to your own care team before changing anything about your Type 1 diabetes management.

Type1Cure is an information and intelligence hub, not a medical advice service. This article summarizes published research and does not provide diagnosis, treatment, or personal medical guidance. Always talk to your own care team before changing anything about your Type 1 diabetes management.

More evidence-labeled coverage across the Type1Cure library.