By the way, I've recently cut back on my coffee intake significantly because I realized I was drinking a second big cup every day even though I wasn't tired and it wasn't even particularly good coffee. I was drinking it because, well that's what I had 'always done'. I hope my kidneys thank me!
Two cups. Every morning. If I have three, I freak out. Three cups on Saturday is tempting, but it always ends badly.
I gave up soda years ago after I realized the afternoon can of Coke was causing me to freak out and get jittery. I think it was more the sugar, though, than the caffeine. I can drink coffee at night and go to sleep. I could never do that with soda.
Bringing it back to topic, I have given up alcohol for Lent every so often. I am always amazed at the weight loss. Empty calories, indeed.