JAMA article: The February 9, 2026, JAMA article contains multiple studies and perspectives on a variety of health topics. One study looks at the relationship between coffee and tea consumption and dementia risk and cognitive function. Another research paper examines the impact of a hypertension notification feature using a smart watch on population screening. The article also includes a perspective on women's health, specifically on the ethical aspects of randomized trials in pregnancy and cesarean delivery at the mother's request. It also compares exposure to aluminum from vaccines and diet. Finally, it deals with determining the duration of oral anticoagulant therapy for new-onset atrial fibrillation after coronary artery bypass grafting.