So when I first answered this thread, I was at 3 to 4 a day, but I've gotten it down to 2 and I have decaf if I crave another cup. My stress levels were getting insane, and I could feel my heart beating really fast fairly often when I was drinking more coffee. Started to scare me lol.
Ya know what's crazy though? My father is 72 and still drinks a pot a day and is healthy as can be, he's a cancer survivor too. I don't know man, maybe I'm fine to drink more? My wife is studying diatetics, and she's managed to convince me that I drink far too much coffee -_-, but maybe I don't. I will say it was starting to heavily affect my sleep, and that's for sure. I sleep better and more consistently on time now just having two cups a day. I may still have three on days that I train, but I haven't been able to train for over a month as I've been recovering from a broken hand and it's pretty tough to lift in a cast. Got it off, good to start lifting light again, guess we'll see if I put my coffee back to three now. This is an interesting topic though, and I feel like this can change a lot over time. Don't know why it affects me so much more than my father when it didn't affect me much at all in my twenties. Strange stuff.