Daily Habits
How Caffeine Moves Through Your Body
Caffeine affects alertness, sleep, and heart rate by moving through the body after you drink coffee, tea, soda, or energy drinks. This article explains how caffeine is absorbed, how long it lasts, and why effects differ by person. You’ll learn what happens in the liver, how genetics and medications change caffeine clearance, and how to time your intake to reduce jitters and protect sleep. It also covers common mistakes and practical ways to track your own response.