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A recent study conducted by researchers at Harvard University reveals that consuming caffeinated coffee may lower the risk of dementia. Analyzing 43 years of data from over 130,000 individuals, the study found that those who drank higher amounts of caffeinated coffee had an 18% lower risk of developing dementia compared to those who consumed little or no coffee. The findings were published in the journal JAMA.
The research also highlighted that similar benefits were observed among tea drinkers, but not among those who consumed decaffeinated coffee. This suggests that caffeine might be the key factor contributing to these neuroprotective effects. However, researchers, including Daniel Wang, an associate scientist at the Channing Division of Network Medicine, caution that while the results are promising, caffeine is likely just one piece of the puzzle in dementia prevention.
The study utilized data from the Nurses’ Health Study and the Health Professionals Follow-Up Study, which tracked participants' diets and cognitive health over several decades. Of the 131,821 participants, 11,033 developed dementia. The research found that regular consumption of two to three cups of caffeinated coffee or one to two cups of tea daily was associated with a lower risk of cognitive decline.
Lead author Yu Zhang, a researcher at Harvard, noted that the study found consistent results across individuals with varying genetic predispositions to dementia. This suggests that caffeine may offer benefits regardless of one's genetic risk factors. While the study emphasizes the potential cognitive benefits of caffeinated beverages, it also highlights the need for further research to fully understand the mechanisms involved.
The study underscores the importance of considering lifestyle factors, such as diet, in dementia prevention. As Harvard Health Publishing points out, caffeine's anti-inflammatory properties and its role in reducing harmful proteins in the brain may contribute to these benefits.
While these findings are encouraging, experts recommend moderation. According to the U.S. Food and Drug Administration, healthy individuals should limit their caffeine intake to no more than 400 milligrams per day, equivalent to about four-and-a-half eight-ounce cups of coffee.