Brain Structure Changes in Type 1 Diabetes May Contribute to Cognitive Decline

Researchers have long known that some people with Type 1 diabetes experience cognitive decline—difficulty with thinking, memory, and mental processing. However, previous brain imaging studies measuring cortical volume and thickness didn't fully explain these changes. This new study looked at a different brain characteristic: cortical gyrification, which measures how folded and complex the brain's outer layer is.

The study involved 153 people total: 51 with Type 1 diabetes and microangiopathy, 53 with Type 1 diabetes without microangiopathy, and 49 healthy controls. All participants underwent brain MRI scans and cognitive testing.

The research found that people with Type 1 diabetes had broadly reduced cortical gyrification—meaning less complex folding patterns—across multiple brain regions. This pattern was especially pronounced in those with microangiopathy. The reductions were most noticeable in areas connected by two major white matter pathways: the arcuate fasciculus and forceps major.

White matter consists of the brain's connecting fibers, and the study found that lower cortical folding was associated with damage to these connecting pathways. Additionally, both the cortical changes and white matter damage correlated with poorer performance on cognitive tests.

Perhaps most importantly, the researchers used statistical modeling to explore how these brain changes relate to each other. Their analysis suggested that cortical gyrification may partly explain the link between white matter damage and cognitive decline. In other words, the change in brain structure appears to be one way that fiber damage translates into thinking problems.

The study provides evidence that brain structure—beyond just size and thickness—may play a role in Type 1 diabetes-related cognitive changes. However, this research describes associations found in brain imaging data; it does not prove that cortical changes directly cause cognitive decline.

These findings add to our understanding of how Type 1 diabetes may affect the brain at a structural level. The fact that changes were most prominent in people with microangiopathy—small blood vessel damage—suggests a connection between vascular health and brain structure in Type 1 diabetes.

The research highlights why brain health monitoring and vascular health management may matter for people with Type 1 diabetes. However, more research is needed to understand whether these brain changes can be prevented or reversed, and whether they eventually affect everyone with Type 1 diabetes or only some individuals.

Source: Metabolic brain disease. 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.