Used to drink a 6 pack of Mountain Dew cans a day. Went for my physical and told my doc I wanted to lose a few lbs (probably was 220 then and wanted to be 210), he told me that he wasn't going to take that seriously if I drank that much sugar soda every day. So, I switched to Diet Mountain Dew.
20 years later, I am sick of being dependent upon caffeine and scared of artificial sweeteners, so I am trying to get used to water and the occasional coconut water. I still do drink some uncaffeinated sodas, but maybe one a day at this point. I've noticed that I pee a lot less often being off caffeine, which is nice for a middle aged man.
I had the opposite issue early on. Literally the first two nights after I cut cokes I woke up multiple times REALLY having to pee. And it wasn't just an urge, but a solid minute of standing. All I can figure is that without the extra sugar en sech, plus extra water, my body was dumping all the water it had stored to fight the soda. After two nights it stopped. I am refusing to weight myself, instead just going off how I feel. My wife commented that I look like I've lost a little weight but that's gotta just be water weight. I hit 196 and was scared to break the 200 mark. So just want back to 185 and I'll be thrilled.