Across the span of a decade, in the United Kingdom, a large group of ordinary adults recorded their daily cups of coffee and tea and then were watched quietly for years as their brains and blood vessels aged. Researchers from Tianjin Medical University, reading that long record, noticed a gentle pattern: those who drank moderate amounts of these beloved drinks were less often struck by stroke or dementia. Yet the observers themselves are careful not to mistake a pattern for a promise, since habits travel together with many other facets of a life. The question now rests with future inquiry, whi
Coffee and Tea Linked to Lower Stroke and Dementia Risk in Large Observational Study
Over 10,000 participants had at least one stroke and over 5,000 developed dementia during follow-up.
An association, not a cause: the study cannot say the drinks do the work.
Mark
Why does this study get attention? Lots of papers link coffee to health.
Mimi
Its size. It tracked 365,682 people for about a decade or more, and thousands of them had strokes or dementia, so the comparisons rest on real numbers.
Mark
What's the central result?
Mimi
Two to three cups each of coffee and tea a day went with a 32 percent lower stroke risk and 28 percent lower dementia risk, compared with drinking neither.
Luke
Careful with that wording. It's an association. The study can't say the drinks caused the lower risk.
Mimi
Agreed, and the researchers say so. They still need to work out how, or if, coffee and tea are responsible.
Mark
Does a person have to drink both?
Mimi
No. Two to three cups of coffee, or three to five of tea, also landed among the lowest-risk groups.
Luke
Worth remembering the habits were self-reported. People estimate their own intake, and the report doesn't say how well that holds up.
Mark
And the post-stroke dementia finding?
Mimi
Drinking more coffee, or coffee with tea, was linked to lower risk there too.
Luke
The coverage doesn't give a figure for that, so I'd treat it as a direction, not a size.
Il Polso
- A quiet pattern in a 365,682-person health database has surfaced, and it asks whether a daily cup might guard the brain.
- Stroke and dementia, two of the most feared threats to aging minds, are the stakes behind a finding that sounds almost too comforting.
- Researchers are racing to separate what coffee and tea actually do from the other habits of the people who drink them.
- The study, published in PLOS Medicine, lands as a promising signal rather than a verdict, with the next step being carefully designed trials.
Across the span of a decade, in the United Kingdom, a large group of ordinary adults recorded their daily cups of coffee and tea and then were watched quietly for years as their brains and blood vessels aged. Researchers from Tianjin Medical University, reading that long record, noticed a gentle pattern: those who drank moderate amounts of these beloved drinks were less often struck by stroke or dementia. Yet the observers themselves are careful not to mistake a pattern for a promise, since habits travel together with many other facets of a life. The question now rests with future inquiry, which must untangle the cup from the company it keeps.
Between 2006 and 2010, more than 365,000 adults in the United Kingdom joined the UK Biobank, a vast health database, and each described how much coffee and tea they drank on an ordinary day. Then came the long wait, with participants followed until 2020 to see who would suffer a stroke and who would develop dementia.
A team from Tianjin Medical University analyzed the record. Among participants aged 50 to 74, 5,079 developed dementia and 10,053 had at least one stroke. The most striking result belonged to people who drank two to three cups of coffee and two to three cups of tea each day: their stroke risk ran 32 percent lower, and their dementia risk 28 percent lower, than among those who drank neither.
The benefit was not confined to people who drank both. Moderate coffee alone and moderate tea alone also appeared among the most protective habits. The two conditions share roots, since stroke interrupts blood flow to the brain and dementia clouds memory and thinking, and the study also found links to post-stroke dementia.
The researchers were measured about what this means. Because the study is observational and relied on self-reported habits, it reveals an association, not a proven cause. The next task is to learn whether coffee and tea truly protect the brain, or whether they simply mark a broader pattern of life.
Between 2006 and 2010, researchers in the United Kingdom enrolled 365,682 people into the UK Biobank, a large health database. Each participant reported how much coffee and tea they drank in a day. Then the researchers waited, following the group until 2020 to see who suffered a stroke and who developed dementia.
A team from Tianjin Medical University, in China, analyzed the results. The participants were between 50 and 74 years old. Over the follow-up period, 5,079 of them developed dementia and 10,053 had at least one stroke.
The headline finding concerns people who drank both beverages. Those who had two to three cups of coffee and two to three cups of tea each day had a 32 percent lower risk of stroke than people who drank neither. Their risk of dementia was 28 percent lower by the same comparison.
The researchers also looked at other combinations. The lowest rates of both stroke and dementia appeared among people who drank two to three cups of coffee a day, or three to five cups of tea, or a combined four to six cups of the two. In other words, the pattern was not limited to people who drank both; coffee alone and tea alone also showed up among the best-performing habits.
The two conditions are related. A stroke happens when something blocks or reduces blood supply to part of the brain, and the risk of one doubles after age 55. Dementia is the broad term for conditions that impair brain function and memory, with Alzheimer's disease the most common form. The Alzheimer's Association estimates that more than six million Americans over 65 live with it. Sometimes dementia symptoms emerge after a stroke, which doctors call post-stroke dementia. According to the study, drinking more coffee, or coffee combined with tea, was also associated with lower risk of that type.
The researchers were careful about what the data can say. The study is observational, and drinking habits were self-reported by participants. That means it shows an association, not a cause. Scientists still have to work out how, or whether, coffee and tea themselves produce the apparent protection.
The work was published in the journal PLOS Medicine. The next step is research that can separate the effect of the drinks from the other habits and circumstances of the people who drink them.
Citazioni salienti
The results are observational, so scientists still must determine how or if coffee and tea directly cause the apparent brain benefit.— Study researchers, Tianjin Medical University
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