Perhaps the more pressing question here is does anyone have any idea WHY my A1C fluctuates the way it does? As of now I've just sort of adopted the reason that maybe I'm different than the "norm"....And for what it's worth, I feel strongly that the doctors in my country (USA) far too often turn to medicinal treatments. The first endo I saw wanted to officially diagnose me as type 2 and wanted me to go on metformin when that 6.7 result came up. I refused and asked him to re test. He took an in office test where he spun the blood around in some machine (acknowledging that wasn't the most accurate method) and it came back 6.1. I asked him to retest me via the lab. 2 weeks later I was a 5.9. Ever since that day I've consciously been aware of the food I am eating. It hasn't helped the fluctuation of results as far as I can tell. And apparently that consciousness diet combined with the IF hasn't helped steady it either.
it shows that the diagnostics are an imprecise science. There are lots of reports on this forum of (long term!) incorrect diagnoses.
Your fluctuating numbers show that many, many factors affect BG. Time of year, amount of light, thyroid function, general stress (eg on holiday your BGs improved.. lower stress, and out of your normal routine), amount of micronutrients (especially salt, magnesium, calcium, potassium), amount of tiring exercise, sleep quality, amount of non-stressful movement,
The body is always in flux. Even when you don't consume carbs, your body makes glucose.
I'm in a bit of a different situation, where my FBGs/BGs sometimes go into "prediabetic" levels, and sometimes "diabetic" levels. But I can keep them under control even with very high carb amounts per day (250-350 grams), if it's the right types of carbs, and some other factors (ie the ones mentioned above)
Bread, especially cakes and pastries, SOMETIMES sends my BGs skyrocketing. On Sat I ate a big chocolate brownie at lunchtime, after having not eaten enough in the morning, and my BG went to 10.5/190 between 1-2.5 hours post-prandial! Today I've eaten 250g carbs, done no exercise, and my BG reached a high of 7, at 90-100 mins post prandial after a meal with 70g of starchy carbs.
Flour+sugar+fat gives me big, delayed BG spikes.