TL;DR
A study of more than 187,000 U.S. adults aged 50 and older found that participants with ADHD were more likely to develop dementia or mild cognitive impairment than those without ADHD. The observational findings, published in JAMA Psychiatry, show an association rather than proof that ADHD causes cognitive decline.
A study led by researchers at the University of Pittsburgh School of Medicine found that adults with attention-deficit/hyperactivity disorder (ADHD) were more likely to develop dementia or mild cognitive impairment later in life. The research, published October 7 in JAMA Psychiatry, analyzed health records and genetic data from more than 187,000 U.S. adults aged 50 and older; it identifies an association, not proof that ADHD causes dementia.
In the study, 6.7% of participants with ADHD developed dementia or cognitive impairment, compared with 3.4% of participants without ADHD. After accounting for factors including age, sex and other health conditions, the researchers reported that people with ADHD had more than four times the risk of developing cognitive impairment over time. This adjusted estimate is distinct from the raw percentages, which describe the share of each group recorded with an outcome.
The team also assessed genetic propensity for ADHD using a score based on common genetic variants. Participants in the highest genetic-risk group had a 35% greater chance of developing dementia than those in the lowest-risk group. The genetic analysis concerns risk associated with variants, not a clinical diagnosis, and does not establish that those variants directly cause dementia.
Among participants who developed cognitive impairment, those with both ADHD and the condition reported worse mental health, lower quality of life and less social satisfaction than people with cognitive impairment alone. They also used about 20% more health care overall in the year after diagnosis, the study report said. The supplied findings do not specify the comparison basis for that health-care figure in further detail.
ADHD and Cognitive Aging
The findings add to evidence that a history of ADHD may be relevant when researchers study cognitive health in older adults. The pattern appeared in both clinical records and genetic-risk analysis, giving researchers more than one type of evidence to examine. Still, neither analysis shows that ADHD itself causes dementia, and the results do not establish that an individual with ADHD will develop cognitive impairment.
The reported differences in quality of life and health-care use also point to possible added needs for people living with both conditions. If further research confirms these patterns, clinicians and health systems may need to consider how ADHD affects care and support after a cognitive diagnosis. The study does not test a prevention or treatment strategy, so it cannot say whether ADHD treatment changes dementia risk.
ADHD cognitive support supplements
As an affiliate, we earn on qualifying purchases.
As an affiliate, we earn on qualifying purchases.
How Researchers Tested the Link
The researchers used data from the National Institutes of Health’s All of Us Research Program, which combines participant health information and genetic data. The study examined adults aged 50 and older, comparing people with and without a recorded ADHD diagnosis and separately evaluating genetic risk scores. Its findings were published in JAMA Psychiatry under the title “Attention-Deficit/Hyperactivity Disorder and Late-Life Cognitive Impairment.”
The report describes the work as building on earlier research from senior author Tharick A. Pascoal’s team. A 2022 study had linked ADHD genetic risk to Alzheimer’s-related brain changes in older adults without cognitive impairment. The current study extends that line of inquiry by examining recorded diagnoses and genetic information in the same large U.S. population.
“This doesn’t prove that ADHD causes dementia, but seeing the same pattern show up independently in medical records and in people’s genes gives us greater confidence that the association is not simply an artifact of how ADHD gets diagnosed. Two different kinds of evidence are pointing in the same direction.”
— Tharick A. Pascoal, senior author and associate professor of psychiatry and neurology at the University of Pittsburgh
memory improvement aids for adults
As an affiliate, we earn on qualifying purchases.
As an affiliate, we earn on qualifying purchases.
Cause and Prevention Remain Open
The study cannot determine whether ADHD contributes directly to later dementia, whether shared factors help explain the association, or whether other influences are involved. One possible concern is that early dementia symptoms could be mistaken for ADHD before a formal cognitive diagnosis. The researchers reported that the association remained statistically significant when they required at least eight years between an ADHD diagnosis and cognitive impairment, making that explanation less likely to account for the full result, but not resolving causation.
The analysis also does not establish whether ADHD medication, including stimulants, changes dementia risk. Researchers raised cardiovascular health as another area to investigate because it has links to both ADHD and dementia. The supplied report does not provide detailed information on the study’s follow-up duration, participant demographics beyond age, or how well the sample represents the wider U.S. population.
As an affiliate, we earn on qualifying purchases.
Questions for Follow-Up Studies
The next step is research into what may account for the association and whether any contributing factors can be changed. The study authors identified ADHD medication and cardiovascular health as open questions, not as proven ways to prevent dementia. Further work would need to test those questions directly and clarify whether the findings apply across different groups of people.
For now, the reported results add a potential factor for future studies of cognitive aging, but they do not change what is known about an individual’s prognosis. The publication reports no planned clinical trial or specific follow-up date. The central unresolved issue is whether the observed link reflects a direct relationship, shared risks, or a combination of factors.
As an affiliate, we earn on qualifying purchases.
Key Questions
Does ADHD cause dementia?
The study does not show that ADHD causes dementia. It found an association between ADHD and later dementia or mild cognitive impairment, using health records and genetic-risk data.
How many people were included in the study?
The researchers analyzed health records and genetic data from more than 187,000 adults aged 50 and older enrolled in the NIH All of Us Research Program.
What were the reported outcome rates?
6.7% of participants with ADHD developed dementia or cognitive impairment, compared with 3.4% of participants without ADHD. These are observed group percentages; the researchers also reported an adjusted risk estimate.
Did the study find that ADHD medication prevents dementia?
No. Whether ADHD medicines, including stimulants, affect dementia risk remains an unanswered research question. This study did not test medication as a prevention strategy.
Source: rss
