I've honestly dropped the amount I drink soda, namely due to having coffee in the morning. That generally is all I needed for the day. Though I still have a can or two of soda during the day. I was much worse as a kid though. I'd have damn near 7 cans of soda a day. Though that was back when my high metabolism could handle all of that.
There is actually very little difference in taste between most CF sodas and their original versions. I love Pepsi and Mtn Dew but I don't like being up all night having panic attacks. That happened when I was about 17 so it's the reason I go caffeine free after 3:00.
Meh the caffeine in soda does nothing for me. In fact when I was younger it had the opposite affect. I'd fall asleep after having a soda.
Your body is odd, Lio. Though I suppose everyone has a odd quarks about them that go beyond the norm. I have, or at least had quite the inhuman high metabolism for most of my youth. I suppose I am still kinda young, though I am hitting the big 3 0 next year.