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A US study suggests moderate coffee or tea consumption may reduce the risk of dementia. Drinking two to three cups of caffeinated coffee or one to two cups of tea daily was linked to a 15 to 20 percent lower risk. Researchers analysed data from more than 130,000 people over up to four decades.
Scientists stress the results show association, not proof. Caffeine may boost alertness and short-term focus. Coffee and tea also contain antioxidants and anti-inflammatory compounds that may protect blood vessels.
However, caffeine can raise blood pressure in some people, a known dementia risk factor. Researchers say overall lifestyle remains central to brain health.
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