Earlier Diabetes Diagnosis May Be Associated with Dementia Risk: Study finds - Video

People diagnosed with type 2 diabetes at a younger age are at a higher risk for developing dementia than those diagnosed later in life, according to a study led by researchers at the NYU Rory Meyers College of Nursing. The findings, published in PLOS ONE, show that the increased risk is especially pronounced among adults with obesity.

"Our study suggests that there may be cognitive consequences to earlier onset type 2 diabetes, and it points to the need for strategies to prevent dementia that consider both diabetes and obesity," said Xiang Qi, assistant professor at NYU Meyers and the study's first author.

To understand how the timing of a type 2 diabetes diagnosis relates to dementia risk, the research team analyzed data from 2002 to 2016 in the Health and Retirement Study, a longitudinal study conducted by the University of Michigan Institute for Social Research. The study included 1,213 U.S. adults aged 50 and over with type 2 diabetes confirmed by blood tests -- and no dementia upon joining the study. Following participants for up to 14 years, 216 (17.8%) developed dementia based on follow-up telephone interviews.

The researchers found that adults diagnosed with type 2 diabetes at younger ages were at increased risk for developing dementia, compared to those diagnosed at 70 years or older. Adults diagnosed with diabetes before age 50 were 1.9 times as likely to develop dementia as those diagnosed at 70 and older, while those diagnosed between 50-59 years were 1.72 times as likely and those diagnosed between 60-69 years were 1.7 times as likely.

Using linear trend tests, the researchers found a graded association between age at diagnosis and dementia risk: for each year younger a person is at the time of their type 2 diabetes diagnosis, their risk for developing dementia increases by 1.9%.

In addition, obesity appeared to influence the relationship between type 2 diabetes and dementia. Individuals with obesity who were diagnosed with type 2 diabetes before age 50 had the highest dementia risk in the study.

Reference: https://www.nyu.edu/about/news-publications/news/2024/november/earlier-diabetes-diagnosis-dementia-risk.html