After a long time of trying to get to the bottom of awful control, I've figured out with CGM that strong coffee raises my blood sugar with rapid and extremely high spikes. (If I've had two cups, it raises up to 18) It happens with or without milk. It's definitely the coffee.
I'm yet to properly experiment with other caffeinated foods but tests this week show I'm getting a rapid but much smaller spike to about 8 or 9 after drinking Diet Coke. With the Diet Coke, my blood sugar then readjusts and falls again. Coffee much more problematic.
This could just be me. I've only been this drinking coffee for two years which has also coincided with an underactive thyroid diagnosis so I'm wondering if the caffeine causes insulin resistance in me, perhaps it is causing thyroxine resistance? My bet is now I've cut out the coffee, my next result will be over-active. I'll update this post when I know.
Needless to say, I've gone cold-turkey on my lovely coffee but I'm intrigued about what other effects there are out there on my blood sugar that I've not figured out yet.
Is anyone else in the same boat? Are there strange things doctors haven't told you about you've figured out yourself? I've got a couple of others but this one has really surprised me.