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4 To 6 Cups Of Coffee, Tea A Day Cuts Dementia, Stroke Risk – Study

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  • Study shows that six cups of coffee and tea a day can cut dementia and stroke risk

  • A new study suggests these beverages can play a significant role in lowering the risk

EKO HOT BLOG reports that scientists have found that drinking a few cups of tea or coffee a day could significantly reduce the risk of having a stroke or developing dementia.

Drinking four to six cups of coffee and tea each day cuts the risk of stroke by almost a third and that of dementia by a quarter, the study suggests.

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Chinese researchers followed more than 360,000 people aged 50 to 79 who were enrolled in the UK Biobank study between 2006 and 2010, monitoring their caffeine habits. During the study period, nearly one in 36 had suffered a stroke and one in 76 had developed dementia.

The risks of dementia dropped by 28 per cent, and those of stroke by 32 per cent, for people who said they consumed two to three cups of coffee and a similar amount of tea each day. That suggested their risk of developing dementia was cut to one in 100 and one in 50 for stroke.

Dr Yuan Zhang, of Tianjin Medical University, China, said: “Our findings raise the possibility of a potentially beneficial association between moderate coffee and tea consumption and risk of stroke and dementia.

“Lifestyle interventions, including promotion of healthy dietary intakes such as moderate coffee and tea consumption, might benefit older adults by improving stroke as well as subsequent dementia. Even small potential health benefits or risks associated with tea and coffee intake may have important public health implications.”

Tea is the most popular drink in Britain, with over 100 million cups drunk every day. Coffee is just behind, with 95 million. Several previous studies have hinted that caffeine may be useful for a number of diseases.

Research has shown that coffee increases the production of granulocyte-colony stimulating factors, which stimulates white blood cells and lowers levels of amyloid-beta protein in the brain.

Caffeine has also previously been shown to reverse cognitive impairment in aged Alzheimer’s disease mice, while the drinks are also rich in plant chemicals called flavonoids, which boost blood flow to the brain.

Alzheimer’s and other forms of dementia affect 920,000 people in the UK, a figure that will rise to two million by 2050.

However, British researchers said there could be other factors driving the decreased risk and it was too early to know whether tea and coffee really were responsible for better outcomes.

cups of coffee

Dr Charlotte Mills, lecturer in nutritional sciences at the University of Reading, said: “The research only shows a link and doesn’t show that the tea or coffee causes the reduced risk of disease. It may be that there are other factors at work.

“However, the finding is consistent with other research showing a link between drinking tea and coffee and other health benefits, such as the reduced risk of heart attack or developing Type 2 diabetes.

“One limitation of this work is that the results do not appear to consider milk consumption as a confounding factor.”

Others warned that too much caffeine could raise the risk of dementia and said moderation was key.

David Llewellyn, professor of epidemiology and digital health at the University of Exeter, who has carried out similar research into coffee, said: “Drinking coffee in moderation is associated with a lower risk of dementia, but the highest risk of dementia is associated with heavy coffee consumption.

“We found that drinking more than six cups of coffee a day was associated with a 53 per cent increase in dementia risk in comparison with people drinking one or two cups a day.

“If people are already drinking tea or coffee in moderation then increasing their consumption further could potentially increase their risk of having a stroke or developing dementia. The potential harm linked with heavy consumption is particularly clear for coffee.

“In theory, people who don’t drink tea or coffee at all may benefit from starting to drink in moderation, and heavy consumers of tea and coffee may benefit from drinking less.

The research was published in the journal PLOS Medicine.

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