There are many benefits to drinking coffee every day — from disease-fighting antioxidants to improved memory and longevity — but when it comes to your caffeine habit, there really can be too much of a good thing.
Just how much caffeine is too much? For the average person, up to 300 mg of coffee a day, or two to four cups of the average brewed coffee, is a moderate amount that isn't harmful. But once you hit more than four cups, you may experience less-than-desirable side effects. Drinking more than 500 mg every day, in fact, can induce anxiety, insomnia, and muscle tremors and can even lead to increased heart rate and blood pressure, headaches, or digestion issues.
If you want to stay away from the caffeine jitters, then limiting yourself to under four cups of coffee per day is a perfectly reasonable plan. However, you may be surprised by how much caffeine is in your favorite caffeinated beverage; it can be much more than you think! See how much caffeine is in your favorite drink.