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If you drink coffee every day, you fill your adenosine receptors with caffeine and your body creates more open adenosine receptors, making it harder and harder to feel the effects of the caffeine. Does anyone know how fast these adenosine receptors disappear if you cease caffeine consumption...

I realize that the Keurig machines have a very weak pump, certainly not enough to press through fine ground espresso beans in a manner in which actual espresso machines accomplish. My question though is, if I grind up my own espresso beans very fine and put them in the reusable k cup filter...