What happened?
Researchers followed 12,409 people who were free of dementia at age 55. Those without smoking, hypertension or diabetes at the initial assessment lived substantially more years without dementia, on average, than those with all three factors.
Why does it matter?
The study connects cardiovascular prevention with brain health. It adds a further reason to discuss smoking, blood pressure and diabetes management during routine care.
How to interpret the evidence
This was an observational analysis, not a trial proving that removing a risk factor guarantees a particular number of additional healthy years. The findings describe groups rather than an individual forecast.
What remains uncertain?
A person’s risk is not determined by these three factors alone. The study does not establish that dementia is inevitable in someone with hypertension or diabetes.
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