I went on a weekend jaunt recently - my second trip since dx w/T1, but the first where I was reliant on restaurants. Ordinarily I drink black tea - and oceans of it too, without more than a point or two fluctuation - so I didn't expect coffee to spike my BG. But it did, a good 30 pts, and unless I corrected immediately it lasted between two and three hours. Not good.
So now I know to avoid coffee unless I dose for it, and a couple of quick online searches seem to indicate it's not an uncommon reaction. And now I'm wondering - what other carb-less or very low carb consumables are known to sometimes do this?