Drinking coffee on everyday may help to reduce dementia, according to a latest study.
More than 850,000 people in the UK have dementia.
The US study looked at caffeine consumption of 6,500 women aged between 65 and 80 and found those who consumed more than 261 milligrams of caffeine a day had a 36% lower chance of getting dementia.
That level is equivalent to two to three eight-ounce cups of coffee, five to six eight-ounce cups of black tea or seven to eight 12-ounce cans of cola.
"What is unique about this study is that we had an unprecedented opportunity to examine the relationships between caffeine intake and dementia incidence in a large and well-defined, prospectively studied cohort of women."
However, she cautioned the research is not entirely conclusive and added that further work would be needed to establish a 'direct link' between caffeine and dementia risk.
She added: "While we can't make a direct link between higher caffeine consumption and lower incidence of cognitive impairment and dementia, with further study, we can better quantify its relationship with cognitive health outcomes.
"Research on this topic will be beneficial not only from a preventative standpoint but also to better understand the underlying mechanisms and their involvement in dementia and cognitive impairment."
Of all the women who participated in the project through the Women's Health Initiative Memory Study, 388 were diagnosed with probable dementia.
In crunching the data, scientists adjusted for risk factors such as hypertension, smoking, alcohol consumption and preexisting cardiovascular disease, among others.
The 6,500 women between 65 and 80 years old self-reported their caffeine consumption over 10 years.
The ones drinking more than 261 milligrams of caffeine each day showed a 36% reduced risk of dementia, according to the study.
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