For about four years I have successfully controlled my BG and indeed my last Hba1c test 6 months ago was a reading of 41. Suddenly three months later I could no longer control my levels and last week I had a reading one day of 11.3. Just before lunch today they were 7.00. I have been so successful I just cannot fathom it out. Any thoughts would be much appreciated.
Anything can up blood sugars. A flu or C19 jab, an infection (viral or bacterial, like a UTI or covid), statins, steroids taken for another issue, prolonged periods of stress, sleepless or restless nights... It doesn't have to be food, per se. Look at these past weeks/months... Did anything change? You kept your diet the same, but did anything else happen? A loss, a change in routine... And barring any of that, could it be the recipe of something you usually eat changed? I did get the rug pulled out from under me a few times, with "new and improved" ingredients from what were perfectly fine staples before.
I hope you'll figure it out. And if push comes to shove, and there's nothing to be found, you might want to consider metformin or berberin to get back in order? (Dunno whether you can tolerate it, but thought I'd put it out there). Maybe get an MOT at the GP to rule anything more troubling out?