Moderate Coffee and Tea May Cut Dementia Risk, Large 40-Year Study Finds

A long-term U.S. study of more than 131,000 adults found that moderate daily caffeinated coffee (about 2–3 cups) or caffeinated tea (about 1–2 cups) is linked to a lower risk of dementia and better cognitive performance, while decaffeinated coffee showed no such benefit; researchers caution the results show associations, not causation, and emphasize that a healthy lifestyle remains important for brain health.