Whether it comes as coffee, tea, soda, or a huge can of Monster, most Americans get their caffeine fix in the morning: The Food and Drug Administration estimates that four of every five of us are jolting ourselves awake with caffeine every day. Of course, this assumes that your coffee consumption is moderate; Hu says that’s between two and five cups a day for most people. Caffeinated sodas can be an option for people who don’t enjoy coffee, but those have obvious problems.