Tea and coffee for brain health? CMC Vellore neurologist explains findings from study of 500,000 people

What if your daily cup of coffee or tea is quietly shaping your brain’s future? While most people rely on it for a quick energy boost, new research suggests it could be doing something far more significant. Backed by large-scale scientific evidence and highlighted by a leading neurologist, this everyday habit may play a powerful role in protecting memory, sharpening thinking, and lowering the risk of serious neurological conditions over time.

Dr Sudhir Kumar, a neurologist trained at CMC Vellore and working with Apollo Hospital, Hyderabad, recently shared insights from a major 2026 study published in JAMA. The research tracked nearly 500,000 individuals and found a strong association between regular consumption of coffee and tea and a reduced risk of dementia, stroke, and cognitive decline.

How much tea or coffee is good?

According to the findings, those who consumed moderate amounts—around two to three cups of coffee or one to two cups of tea daily—experienced the most significant protective benefits compared to non-consumers. This “sweet spot” appeared to offer a balance where the brain gains maximum advantage without overconsumption.




Beyond lowering disease risk, the study also highlighted noticeable improvements in everyday brain function among regular consumers. Participants who drank coffee or tea performed better in visual memory tasks, showing an enhanced ability to recall patterns and spatial details. They also demonstrated stronger executive function, which influences planning, decision-making, and problem-solving. In addition, faster processing speeds were observed across age groups, suggesting that the brain remains more responsive and efficient with consistent intake.

Benefits of drinking coffee and tea

The biological explanation behind these benefits lies in the compounds naturally present in these beverages. Coffee and tea are rich in antioxidants and bioactive substances that actively support brain health. Anti-inflammatory effects from compounds such as chlorogenic acid in coffee and catechins in tea help reduce oxidative stress, a key factor linked to ageing and neurodegeneration.


Improved vascular function ensures better blood flow to the brain, keeping neurons supplied with oxygen and essential nutrients. At the same time, enhanced insulin sensitivity contributes to healthier metabolic function, which is increasingly being recognised as critical in preventing conditions like Alzheimer’s disease.

Through his insights, Dr Sudhir Kumar highlights how something as routine as a daily beverage can become a long-term investment in cognitive health. What feels like a simple morning ritual may, in reality, be one of the easiest and most accessible ways to support brain function and resilience over the years.