Drinking too much caffeine is not good. It can make a person sick. I use to drink alot of caffeine, and then I started having episodes where my heart was beating fast. It was the result of the caffeine. I stopped all caffeine for a while. coca cola is also not good. I heard it has more acid in it then pepsi. One girl I met told me after she stopped drinking coca cola she would have headaches. My grandmother and cousin get headaches frequently if they don't have their coffee. The coffee is affecting something in the brain that causes them to have headaches when they don't have that usual coffee.