... caffeine, not just avoid the crash but actually understand what it's doing in my body. This week, JAMA published a 43-year study on 130,000 people that made me feel very vindicated. They found that 2-3 cups of caffeinated coffee a day cuts dementia risk by 18%, even for people with high genetic risk. Here's the catch, though: caffeine has a half-life of 5-7 hours. So, that afternoon cup