Your daily cup of coffee may do more than help you wake up in the morning. A long-term study of American adults suggests that regular consumption of caffeinated coffee is associated with a significantly lower risk of dementia and better cognitive health as people age.
Researchers found that adults who consumed larger amounts of caffeinated coffee developed dementia at significantly lower rates than those who rarely or never drank it. The findings were based on follow-up periods extending up to 43 years, providing valuable insight into how daily drinking habits are linked to brain health over time.
The strongest associations appeared among people who drank two to three cups of caffeinated coffee each day. Tea consumption was also associated with better cognitive outcomes, although the amount associated with the greatest benefit was slightly lower.
Interestingly, decaffeinated coffee didn’t show the same benefits, which raises the question of whether caffeine itself might help explain this link.
Coffee drinkers showed much lower rates of dementia
One of the most striking findings concerns the difference in dementia rates between regular coffee drinkers and people who consume little or no coffee.
Among American adults who drank larger amounts of caffeinated coffee, researchers recorded 141 cases of dementia per year per 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.
Dementia is a general term for conditions that progressively interfere with memory, thinking, reasoning, and the ability to perform daily activities. Alzheimer’s disease is the most common cause, although several other brain disorders can also lead to dementia.
Although occasional forgetfulness may be a normal part of aging, dementia causes cognitive difficulties severe enough to disrupt daily life. Identifying lifestyle habits associated with lower risk of dementia is therefore an important area of research, particularly as populations age.
The results suggest that regular consumption of caffeinated coffee could be one of these habits. However, the results show an association rather than proving that coffee directly prevents dementia. Other differences between coffee drinkers and coffee avoiders could also contribute to the observed results.
Coffee was also linked to better cognitive health
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 skills had declined.
Researchers found that 7.8% of adults who consumed larger amounts of caffeinated coffee reported subjective cognitive decline, compared to 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 these difficulties have not necessarily been confirmed by formal cognitive testing. A person who suffers from it may feel that it has become more difficult to remember information, concentrate, or find the right words.
Such complaints do not automatically indicate dementia. Nevertheless, they can provide useful information about how people perceive changes in their cognitive abilities as they age.
The lower percentage among caffeinated coffee drinkers adds to evidence linking coffee consumption to healthier cognitive aging.
How much coffee provides the greatest benefit?
The researchers also examined whether the amount of coffee consumed was related to the strength of the observed benefits.
Drinking two to three cups of caffeinated coffee per day was associated with the most favorable outcomes in dementia risk and cognitive functioning.
Notably, this association remained apparent regardless of participants’ genetic risk of developing dementia. In other words, the relationship between coffee consumption and brain health has been observed even in people whose hereditary characteristics might make them more vulnerable to the disease.
Genetic risk refers to the influence of inherited variations in DNA that can increase or decrease the likelihood that a person will develop certain diseases. Although genetics can play an important role in dementia, they are only part of a much larger picture that includes age, general health and lifestyle.
The results also suggest that drinking larger amounts of coffee isn’t necessarily better. Consumption beyond the range associated with the greatest benefits does not appear to provide additional protection.
Tea Drinkers May Also Benefit, But Decaf Was Different
Coffee isn’t the only beverage associated with better brain health. Researchers found that tea consumption was also associated with a lower risk of dementia 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 does not appear to produce any other benefits.
However, the study did not distinguish between caffeinated and non-caffeinated tea. As a result, the results cannot establish whether caffeine was responsible for the association observed in tea drinkers.
The results for coffee provided an additional clue. While regular caffeinated coffee was associated with a lower risk of dementia and better cognitive outcomes, decaffeinated coffee did not provide the same benefits.
Caffeine is a natural stimulant found in coffee, tea and many other plants. It acts on the central nervous system and is best known for temporarily increasing alertness and reducing the feeling of fatigue.
Whether caffeine also contributes to better brain health over many years is another question. The difference between regular and decaffeinated coffee is 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. For coffee drinkers, two to three cups per day seemed to offer the strongest association, while one to two cups of tea showed the most favorable results among tea drinkers.
Although more research is needed to determine whether these drinks directly influence dementia risk, the long-term results offer encouraging news for people who already enjoy coffee or tea as part of their daily routine.
Gn Health
