Michael Dickens has read the research and performed two self-experiments on whether consuming caffeine builds up tolerance, and if yes, how quickly.

First literature review:

What if instead of taking caffeine every day, you only take it intermittently—say, once every 3 days? How often can most people take caffeine without developing a tolerance?

The scientific literature on this question is sparse. Here's what I found:

Second literature review:

If you [...]

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Narrated by TYPE III AUDIO.