This article will be the first one in a series on caffeine and coffee and here I am going to answer the question on What Is Caffeine.
Before I tell you about Caffeine, I need to mention a substance called Adenosine, which has multiple functions in the human body. One of its functions is as an inhibitory neurotransmitter in the brain, and is thought to accumulate in the brain during the time we are awake.
The primary function of caffeine in the brain is related to this substance, Adenosine. I'll get to that in a minute.
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