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Completely anecdotal; the amount of people that do not consume caffeine seems overrepresented among very very smart people (i.e. math profs, researchers etc)

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On the other hand, the amount of people that consume excess amounts of caffeine also seems overrepresented among such people.

It might be that both not consuming caffeine, and being very very smart, have the same root cause - like good sleep patterns.

Just an unresearched thought I had!

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