Over the years, I have quit caffeine for years at a time. I slip back into the habit when I forget how unnecessary it is to functioning at a high-level.
A big desert after lunch…coffee.
Too much booze the night before…coffee.
Not enough sleep…coffee.
Lots of time behind the desk and not enough time at the gym…coffee.
Staying out extra late…expresso martini.
Not making time to meditate…coffee.
Not enough fruit…coffee (beans).
Caffeine paves over bad habits, and conversely the absence of it make living well...essential.