If it is any help, once I began to get below 8mmol/l my metabolism really did seem to change and my numbers went on down even though I kept to the regime I had hit on.
I have had people tell me how well I have done as it must be an extreme diet and hard to stick to - and I blink and shake my head. Personally I feel a bit embarrassed that it has been so easy to do. Maybe I should be trying a lot harder - but then - what would it have done?
OK - maybe I'd be a lot thinner by now, and really have nothing to wear - not be fretting because I have regained a couple of Kg, but I noticed that the scales are beginning to drop just a little now - too many nuts and too much cheese I suspect. Easily done, easily stopped.
I do have the advantage of a BSc degree and a near genius level IQ - though the sense of humour is far more likely to advance my career these days.
Of all the advice given, the concept of checking how things affect you is the one to go with. If you consistently go high due to one thing, it will add up - pick out what it is and do something about it - problem solved, on to the next one.