I tend to TRY not to drink caffeine. That all went out the window when I started working nights. I need to be able to function right? I'm not a huge fan of diet soda, but the full leaded stuff has a ton of empty calories so I don't like to drink tons of that either. I really like Coke Zero because it tastes more like original coke. I bought some Vanilla Coke Zero the other day and I think I'm in love. YUM. What's your guilty pleasure?