Drinking 2–3 cups of coffee a day could reduce cognitive decline risk

A new long-term study is offering fresh insight into the potential brain-boosting benefits of caffeine, suggesting that moderate daily consumption of coffee or tea could help reduce the risk of dementia.

The research, published in the Journal of the American Medical Association, followed nearly 132,000 participants over a period of up to 43 years.

Findings revealed that individuals who consumed two to three cups of caffeinated coffee per day had an 18% lower risk of developing dementia compared to those who consumed little or no caffeine.

Similar benefits were also observed among participants who drank one to two cups of caffeinated tea daily.

Neurologist Dr. Hugh Cahill described the study as “impressive,” citing both its large sample size and extended follow-up period.

He noted that the findings provide encouraging evidence supporting caffeine’s potential neuroprotective effects when consumed as part of a balanced lifestyle.

Experts believe caffeine may influence brain health through several biological mechanisms.

On a cellular level, it activates proteins linked to learning and memory formation, while also supporting neuron growth and survival.

Additionally, caffeine may improve vascular function by promoting the widening of blood vessels in the brain, which could help lower the risk of stroke and vascular dementia.

Beyond caffeine itself, coffee contains a range of bioactive compounds, including trigonelline, diterpenes, and melanoidins, that may independently contribute to improved cognitive function.

However, specialists caution that moderation remains key. Consuming more than the recommended two to three cups of coffee per day, or one to two cups of tea, does not appear to offer additional benefits and may instead lead to negative side effects such as sleep disruption, anxiety, and digestive issues.

Health experts also stress that caffeine should not be viewed as a standalone solution.

Maintaining overall brain health requires a broader approach, including a balanced diet rich in plant-based foods, regular physical activity, sufficient sleep and strong social connections.

While the findings add to growing evidence linking caffeine to cognitive benefits, researchers note that further studies are needed to fully understand its long-term effects, particularly across different age groups and sources of caffeine.