Do you know if eating low carb is cumulative? Are levels likely to improve of their own accord?
Interesting question, and I can only answer personally; although some others have found similarly.
For me, my levels improved as I trimmed up, but it wasn't in a steady linear fashion. I have never gone down the strictly LCHF route, much preferring a mildly hybrid approach that fitted better with the lifestyle my OH and myself enjoy, and the foods I am able to source when overseas for protracted periods.
But, back largely to your query.
Having reduced carbs, my body would somehow find or settle on a range and stay there for a while, then, apparently, with no changes to anything I was doing, the range would shift down a notch, then repeat that cycle. Clearly that cycle isn't perpetually repeatable, as everyone will have their own limits as to how low they either are willing to push themselves, or where their bodies can physiologically take them any lower. Much of this is around balance - in terms of eating, lifestyles, physical capabilities, other health issues etc.
Other people have also found weight loss has apparently impacted on their scores, but I can't really recall too many people experiencing the notching I did.
The science around the weight loss and improved blood scores relates, largely to visceral fat and insulin resistance. There's some great reading here, if you want to understand more:
http://www.ncl.ac.uk/magres/research/diabetes/
Now, to be absolutely clear; I am not advocating you consider the Newcastle Diet. That would move my sledge hammer/nut analogy to a whole different level!
This thread also has some great reading, relating to carb reduction, including a couple of straightforwardly written papers by
@Southport GP , whose practise hosted their own research programme, with impressive results.
Like the rest of us, I think you have to do a lot of reading and thinking. If there was a panacea to all of this, we would have given you the key on reply #2. But, there are some rather compelling principles we can apply to improve our blood scores and overall health. With an HbA1c of 42, I imagine your required solution will be light touch. I would urge you not to get drawn into heavy handed.
Well, that should keep you occupied for a while.
