Measuring caffeine consumption is harder than you think
Caffeine is a well-established performance enhancer; this is no secret, with many athletes using it to improve their performance. Non-athletes know this too, which is why almost 80% of the world’s population consume caffeine on a daily basis. As a result, caffeine is ubiquitous, and we are exposed to it in a number of different ways; primarily through hot drinks (such as tea or coffee), but also through foods (like dark chocolate) and medicines (many extra strength cold and flu or pain medicines contain caffeine).
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