September is World Alzheimer’s Month, a time to raise awareness about Alzheimer’s disease and other forms of dementia, support those affected, and encourage conversations about brain health.
For coffee lovers, there is some encouraging research to consider. A large 2026 study published in JAMA found some added benefits of caffeine. According to the study, people who consumed more caffeinated coffee had a lower risk of developing dementia and reported less cognitive decline over the course of the study.
The findings add to a growing body of research exploring the relationship between caffeine, coffee, and brain health.
What Did the Study Find: Is Coffee Good for Your Brain?
The study, titled Coffee and Tea Intake, Dementia Risk, and Cognitive Function, followed 131,821 participants from two long-running U.S. health studies: the Nurses' Health Study and the Health Professionals Follow-up Study.
Researchers tracked participants for up to 43 years, with a median follow-up of nearly 37 years. During that time, 11,033 cases of dementia were documented.
The researchers looked specifically at caffeinated coffee, decaffeinated coffee, and tea to determine whether consumption was associated with dementia risk and measures of cognitive function.
The results were particularly interesting for caffeinated coffee.
Participants in the highest category of caffeinated coffee consumption had an estimated 18% lower risk of dementia compared to those in the lowest category. The researchers also found that higher caffeinated coffee intake was associated with a lower prevalence of subjective cognitive decline.
In one of the study cohorts, higher caffeinated coffee consumption was also associated with slightly better performance on objective cognitive testing.
How Much Coffee Was Associated With the Most Favorable Results?
More coffee wasn't necessarily better when it came to the correlation between caffeine and dementia.
The researchers found a nonlinear relationship between caffeinated coffee intake and dementia risk, with the most pronounced differences associated with approximately 2 to 3 cups of caffeinated coffee per day. For tea, the most pronounced differences were associated with approximately 1 to 2 cups per day.
It's important to note that a "cup" in a research study may not correspond to the size of a large coffee-shop beverage. The study's findings should therefore not be interpreted as a recommendation to consume a specific amount of coffee.
Instead, the results suggest that moderate coffee consumption may be associated with more favorable cognitive outcomes in terms of dementia and drinking coffee.
What About Decaf?
One of the most interesting aspects of this research was the distinction between caffeinated and decaffeinated coffee.
The researchers did not find the same association between decaffeinated coffee intake and lower dementia risk or better cognitive performance. Higher tea intake showed associations similar to caffeinated coffee.
This raises questions about whether caffeine itself, or other compounds that tend to occur alongside caffeine in coffee and tea, could play a role.
However, the study was not designed to establish exactly why these associations were observed.
Why Might Coffee Be Connected to Cognitive Health?
Researchers are still working to understand the biological mechanisms that could explain the relationship between drinking coffee and dementia.
Coffee contains caffeine as well as many other naturally occurring compounds, including polyphenols. Researchers have proposed several possible pathways through which coffee consumption could be related to cognitive health, including effects involving inflammation, metabolism, cardiovascular health, and the nervous system.
But these mechanisms remain an area of ongoing research.
There may also be lifestyle factors involved. Coffee drinking can be part of daily routines that include social interaction, work breaks, physical activity, or other behaviors that may influence overall health.
Does Coffee Prevent Dementia and Is Coffee Good for Alzheimer's Patients?
Association Does Not Mean Prevention. This is perhaps the most important takeaway.
The study was a prospective observational cohort study. Researchers observed people's coffee consumption and health outcomes over many years and adjusted their analysis for potential confounding factors.
That makes the findings valuable, particularly given the study's large population and exceptionally long follow-up period. But observational research cannot establish that drinking coffee directly prevents dementia.
In other words, the results show a relationship between caffeinated coffee consumption and lower dementia risk—not that coffee is a treatment for dementia or a guaranteed way to prevent Alzheimer's disease.
What This Means for Coffee Drinkers
If you already enjoy a cup of caffeinated coffee as part of your daily routine, this research offers another interesting reason to appreciate the ritual.
The findings suggest that moderate caffeinated coffee consumption is associated with lower dementia risk and modestly better cognitive outcomes. The strongest associations were seen around 2 to 3 cups per day. While decaffeinated coffee did not show the same associations in this study, there are some other benefits to drinking decaf.
Ultimately, brain health is about much more than one beverage. Healthy aging involves a combination of factors, including staying physically active, eating a balanced diet, getting adequate sleep, maintaining social connections, and managing cardiovascular health. Coffee can be one small part of that bigger picture.
A Coffee Break Can Be About More Than Coffee
For many of us, coffee is more than caffeine.
It's the quiet moment before the day begins. It's a conversation with a friend. It's the ritual of preparing a cup for someone you love. It's the pause between a busy morning and an even busier afternoon.
Those everyday moments matter.
During World Alzheimer’s Month, we're reminded of the importance of caring for our brains, staying connected with the people around us, and making time for meaningful moments. And if one of those moments happens to include a cup of coffee, that's something worth savoring.
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