Well, if you are a heavy caffeine user (like me--meaning 500mg+ of caffeine a day) then the answer is, yes, caffeine use can cause brain fog. Caffeine acts as a stimulant on the brain, blocking the chemical Adenosine which, when free to float around, slows down our brain and makes us feel tired. Caffeine blocks the landing sites for adenosine which causes us to feel mental stimulated as the tiredness is held at bay. The problem is, our body figures this out very quickly and adapts so that it can keep everything in balance. The body doesn't appreciate the brain being in such an overworked state and so it starts producing huge amounts of adenosine to compensate for the stimulants. This is why is takes an every increasing amount of caffeine to feel the same buzz, because there are so many additional receptors to block off. What's more, as your brain becomes tolerant of your caffeine intake, not only does it have less effect but you process it more quickly. There were times when I only felt "normal" and able to work to my fullest extent when I was physically drinking something caffeinated!
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