February 13, 2026

@michaelokun

Coffee, Tea and Dementia Risk: Is your daily brew brain protective? What does dementia risk mean? Dementia risk refers to the likelihood over time of developing a condition that affects memory, thinking, behavior and independence. Zhang and colleagues describe in a new paper in JAMA how long term intake of caffeinated coffee and tea relates to dementia risk, subjective cognitive decline, and objective cognitive performance. Key Points: - Higher caffeinated coffee intake was associated w/ lower dementia risk up to 43 years of follow up, w/ a hazard ratio of 0.82 in the highest vs lowest quartile. - Tea intake showed similar inverse associations w/ dementia risk and subjective cognitive decline, whereas decaffeinated coffee did not show a protective association. - The most pronounced associations were observed at moderate intake levels, about 2 to 3 cups per day of caffeinated coffee or 1 to 2 cups per day of tea, suggesting a nonlinear dose response pattern. My take: This is one of the most rigorous long-term prospective looks at coffee, tea and cognitive outcomes. The signal is not massive at the individual level, however it is consistent across dementia diagnosis, subjective complaints and telephone based cognitive testing. The pattern matters. Moderate intake appears to be the 'sweet spot.' More is not necessarily better. Importantly, the signal tracks w/ caffeine containing beverages, and not decaffeinated coffee, which strengthens the biologic plausibility that caffeine or related compounds may be driving the association. Here are 5 points that resonated w/ me: 1- Moderate caffeinated coffee intake around 2 to 3 cups daily was linked to lower dementia risk when compared to no intake. 2- Tea showed a similar protective pattern, especially at 1 to 2 cups daily. 3- Decaffeinated coffee did not confer the same benefit, suggesting caffeine may be a key contributor. 4- The cognitive differences on testing were modest, so this is not a magic shield, however it may shift population risk in a meaningful way. 5- Lifestyle patterns matter and coffee or tea should be viewed as one piece of a broader brain health strategy. #michaelokun #fixelinstitute #parkinson