For all of its wild popularity, caffeine is one seriously misunderstood substance. It’s not a simple upper, and it works differently on different people with different tolerances—even in different menstrual cycles. But you can make it work better for you.
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We’ve covered all kinds of caffeine “hacks” here at Lifehacker, from taking “caffeine naps” to getting “optimally wired.” And, of course, we’re obsessed with the perfect cup of coffee. But when it comes to why so many of us love our coffee, tea, soda, or energy drink fixes, and what they actually do to our busy brains, we’ve never really dug in.
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