I've basically been drinking at least a bottle of soda most days since junior high, when I started making money and had access to vending machines. But since I have a pretty decent desire to live past 35, I decided to cut it out of my diet, after more than 10 years of consuming probably a metric ton of sugar.
Holy shit. For the first three days I could not control my emotions. I didn't understand what was happening. I was totally fine one minute, then the next I wanted to murder the mail man for getting my package slightly damp in the POURING RAIN. Like, the things that set me off weren't even remotely logical, or things that I would normally be even vaguely upset about.
At first I thought maybe it was just some new form of anxiety, which I have had major issues with in the past, and have mostly dealt with in a healthy, productive way. Then I realized, I'm basically taking a major chemical - sugar - that I've been literally pouring into myself at a rate of at least a liter of soda per day, and completely cut it out of my system. I talked to my doctor this week about an unrelated issue, and mentioned it to him; he said I was lucky I didn't hurt myself altering my blood sugar that drastically. Kind of melodramatic, IMO, but it's nice to know I wasn't just crazy.
It's been two weeks now, and I'm more or less sane. The pros are that I have less trouble sleeping, can wake up and function almost immediately (instead of needing an hour to "wake up"), and I feel much healthier. My metabolism seems to be working better, I'm actually losing some significant weight in just two weeks. The blood pressure issues I was having are almost non-existent.
The cons are that I'm still REALLY tired about mid-day. If I wake up at 8AM, by about 2PM I'm ready to fall asleep. I try and drink a cup of coffee to stay away, but I think it's just going to take a few more weeks of being constantly exhausted to get my body used to having normal sugar levels.
SO....long story short, if you're like me and drink way too much soda/sugary beverages every day, I highly encourage cutting it out altogether. It's such a dumb reason to be slowly killing yourself.