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Re:Why I Quit Coffee and How That's Been Working Out by maaaats on Saturday May 02, 2015 @06:58AM (#9476619)
> My biggest surprise was that the "booster" effect of coffee in the early morning might have been a pure placebo effect

It's not necessarily placebo, but the fact that your body has adjusted to caffeine, so you need it in the morning to reach "normal" levels.

Re:Why I Quit Coffee and How That's Been Working Out by jacalata on Saturday May 02, 2015 @09:56AM (#9477044)
But he is saying that he experiences the same ramp-up in the mornings without caffeine, so what he thought was the experience of going from uncaffeinated to normal appears to have been unrelated to the caffeine and was actually the experience of going from just-woken-up to awake.