A long-running study of U.S. adults suggests that regular consumption of caffeinated coffee is associated with a substantially lower risk of dementia and better cognitive health as people age. The findings, based on follow-up periods extending up to 43 years, offer a detailed look at how everyday drinking habits relate to brain health over time.
Coffee Consumption and Dementia Rates
Researchers found that adults who consumed higher amounts of caffeinated coffee developed dementia at considerably lower rates than those who rarely or never drank it. The data revealed a stark contrast in annual incidence rates. Among U.S. adults who drank higher amounts of caffeinated coffee, researchers recorded 141 dementia cases annually for every 100,000 people. In comparison, the rate was 330 cases per 100,000 people each year among those who rarely or never drank caffeinated coffee.
The strongest associations appeared among people who drank two to three cups of caffeinated coffee each day. Notably, this association remained apparent regardless of participants’ genetic risk of developing dementia. The relationship between coffee consumption and brain health was observed even among people whose inherited characteristics might make them more vulnerable to the disease.
However, the results suggest that drinking larger amounts of coffee is not necessarily better. Consumption beyond the range associated with the strongest benefits did not appear to provide additional protection. Coffee was not the only beverage associated with better brain health. Researchers found that drinking tea was also linked to lower dementia risk and better cognitive functioning. For tea, the strongest associations appeared among participants who consumed one to two cups per day. As with coffee, drinking more than this amount did not appear to produce further benefits.
Subjective Cognitive Decline and Decaf
The potential benefits were not limited to diagnosed dementia. Participants who drank more caffeinated coffee were also less likely to report that their memory or thinking abilities had declined. Researchers found that 7.8% of adults who consumed higher amounts of caffeinated coffee reported subjective cognitive decline, compared with 9.5% of those who rarely or never drank it.
Subjective cognitive decline refers to changes in memory or thinking that people notice themselves, even when those difficulties have not necessarily been confirmed by formal cognitive testing. Someone experiencing it might feel that remembering information, concentrating, or finding the right words has become more difficult. Such complaints do not automatically indicate dementia. Nevertheless, they can provide useful information about how people perceive changes in their cognitive abilities as they grow older.
The study also examined the role of caffeine itself. Interestingly, decaffeinated coffee did not show the same benefits, raising questions about whether caffeine might help explain the connection. Caffeine is a naturally occurring stimulant found in coffee, tea, and several other plants. It acts on the central nervous system and is best known for temporarily increasing alertness and reducing feelings of tiredness. Whether caffeine also contributes to better brain health over many years is a separate question.
The study did not distinguish between caffeinated and noncaffeinated tea. As a result, the findings cannot establish whether caffeine was responsible for the association observed among tea drinkers. The difference between regular and decaffeinated coffee makes the possibility worth investigating, but it does not establish caffeine as the cause of the observed benefits.
Taken together, the findings suggest that moderate consumption of caffeinated coffee and tea may be associated with healthier brain aging. While additional research is needed to determine whether these beverages directly influence dementia risk, the long-term findings offer encouraging news for people who already enjoy coffee or tea as part of their daily routine.
Source: ScienceDaily
