An HbA1c of below 42 is considered normal in the UK (that is, below prediabetic), and anything above 47 is considered fully diabetic, for type 2s.
In America, the cut off for prediabetes is lower, so they have a larger chunk of the population classified as 'not normal'.
There is a school of thought that says truly 'normal' people rarely ever had a blood glucose higher than 6.6 mmol/l (which roughly equates to the bright green area in the image below). Of course, there is a difference between current (snapshot) blood glucose levels, and HbA1c (average) blood glucose levels, so this comparison is rather inaccurate.
The reason for the idea that 6.6 is the max safe level, is that there have been studies (you can find the references to them on the
https://www.bloodsugar101.com/ website) that show damage is done to the insulin producing cells in the pancreas (the cells are being effectively bathed in too much glucose which causes the damage, if you spend much time above 6.6mmol/l. The effect of this is that, in the long run, you progressively damage your capacity to produce insulin, and over time, will become unable to produce your own insulin in sufficient quantities, leading to progressively worsening blood glucose control.
The damage may take years to emerge, but it is what leads to eye, nerve, circulation and kidney damage. Diabetes is the largest cause of blindness, dialysis and amputation for the elderly.
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Congrats on your acceptance. I don't say that lightly. It is a huge step. No matter where we are on our journey with D, accepting where we are, without beating ourselves up for things not being 'perfect' is a massive help, because it allows us to work from where we are, rather than making things worse for ourselves before we start.
If you choose to nudge your HbA1c downwards, there are a number of ways you can do that, from dietary changes such as lowering carb intake, more activity and exercise, changing eating times and frequency, and even more medication. The NHS is supposed to keep tweaking medication and offering assistance until we have HbA1cs of
at least below 53.