My HbA1c has been below 6 for a while now, and I do it by very low carb and no diabetic meds, so have a slightly different situation from you.
A couple of weeks ago, we went on hol and I relaxed my carb control a lot (for me) although I still guesstimate that I kept below 100-120g carbs every day.
Two things made it acceptable (IMO)
- Firstly, we were walking a lot. Hours a day, and that knocked my baseline blood glucose down to the low 4s by reducing my insulin resistance.
- Secondly, I was wearing a Freestyle Libre, which meant that I could track and time my blood glucose rises and falls.
For the 6 days that I ate like this, I reached 8-9mmol/l for about an hour each day, and hit 12mmol/l on one day. The rest of the time I was in the 4.0-6.0 range.
By the 6th day, I was running out of steam, heavy limbed and feeling VERY glad to return to my comfortable very low carbing.
but the REALLY INTERESTING THING (for me) was that according to the Libre, my blood glucose average for the whole week was 6mmol/l.
That is still at the bottom of being Pre-diabetic! (my prick tests with my standard meter showed that this was an accurate Libre sensor, so I am confident these figures are as accurate as is reasonable to expect).
Yet I was still starting to feel grotty, presumably more because of the bg fluctuations, than because my bg was running higher than usual.
Plus (and I find this fascinating) a few days after we got home, I had a single nasty stabbing pain jab me in the sole of the right foot. I used to get them occasionally, before I adopted Low Carb High Fat, but they disappeared with my new lower low carb blood glucose levels. I now consider them to be the first signs of neuropathy, and the fact that a week of fluctuating blood glucose caused the stabbing to recur is a timely warning for me, don't you think? I am certainly taking it as one. The thought of experiencing that dreadful stabbing on a daily or continuous basis is a very strong motivation to keep me on the Very Low Carb straight and narrow!
So, as I said, a different situation from you, but an interesting comparison. In future, I intend to lapse my carb control when on holiday, but not on consecutive days, and only on days with lots of physical activity. I figure that will allow me to reach the end of the holiday without the sluggishness I had this time.