Moderate Coffee and Tea Consumption Linked to Lower Dementia Risk in Long-Term Study
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A decades-long study of over 130,000 U.S. healthcare professionals found that moderate caffeine consumption was associated with a significantly lower risk of dementia. For adults aged 75 and younger, drinking roughly two to three cups of coffee daily was linked to a 35% lower risk. The research also suggests one to two cups of tea per day offered the strongest protective effect.
Facts First
- Moderate coffee intake linked to lower dementia risk in adults under 75, with two to three cups daily associated with a 35% lower risk.
- One to two cups of tea per day offered the strongest protection against dementia in the study.
- The study followed 131,821 nurses and healthcare professionals for up to 43 years, with 8% developing dementia.
- Analysis of 38 additional studies supports the link, showing caffeine drinkers had a 6%-16% lower dementia risk.
- Caffeine blocks adenosine, a brain chemical that slows the activity of key messengers like dopamine.
What Happened
A large U.S. study followed 131,821 nurses and healthcare professionals for up to 43 years, starting when participants were in their early 40s. During the study, 11,033 participants, representing approximately 8% of the group, developed dementia. In adults aged 75 and younger, consuming approximately 250mg-300mg of caffeine per day—equivalent to roughly two to three cups of coffee—was linked to a 35% lower risk of dementia. The study also found that one to two cups of tea per day offered the strongest protection against dementia. Researchers analyzed results from 38 additional studies which showed caffeine drinkers had a 6%-16% lower dementia risk compared to non-drinkers.
Why this Matters to You
This research suggests your daily coffee or tea habit may be contributing to your long-term brain health. For adults under 75, moderate consumption appears to be linked to a substantially lower risk of a condition that affects millions. The findings indicate that the protective effect may have an optimal range, which could help you make informed choices about your caffeine intake.
What's Next
Further research is needed to confirm these observational links and understand the precise biological mechanisms. The study notes that caffeine blocks adenosine, a chemical that slows brain messengers, and other research has linked regular coffee consumption to lower levels of amyloid plaques in the brain. Future studies may help clarify the ideal amount and source of caffeine for cognitive benefits and determine if these protective effects hold for older populations.