Why does drinking coffee in then morning sometimes cause immediate evacuation of bowels and/or bladder and other times have no effect?

Question

I know that coffee is a diuretic but I don’t understand why the effects can vary so much day to day

In: Biology

Answer 1

Some of it may be that your body knows it isn’t a good time. A 15 minute break between meetings where you have 20 minutes worth of things to do? Your body seems to know better.

I’ve heard teachers say that at the beginning of the year their bodies still think it’s summer break and need to be reminded that they can’t hit the bathroom until their first break of the day.