This thread has put my mind at ease. I thought I was bad on 4 cups a day (double measures, though, so it's more like 8). I like good coffee but at work I just need the hit, and put up with the crap coffee in here. If I walk into the gym like a zombie I go over to the coffee machine and have a couple of cups of their dark coloured water, I mean coffee.
There was me thinking my coffee drinking was a problem. Ach well * boils kettle *.
I agree. People freak out when I tell them about my 4-5 cup a day habit of coffee. If I said 20, I think some people's heads would literally explode.
I guess 20 cups of coffee is better than getting it from some sugary source...but I would around 20 cups would have to have some effect also if you have stomach issues like acid reflux or whatever too...