Caffeine after surgery??

My program just said not for 3 weeks because of the vasoconstriction and dehydration risk (although I'm not sure I buy that one since it's such a mild diuretic in the first place). However, the only caffeine I ever drank was diet soda, so I've probably kicked the caffeine habit for good.

I was never told that, but I also had surgery 9 years ago. I drink caffeine pretty much daily.. all sorts of forms and am fine.