Hi
@AndyStein. You brought up some really important and interesting points there about insulin resistance based type two.
The insulin being like a key to unlock the starving cells of glucose is a metaphor that I have always had problems with - when I was first introduced to it in an education course for living with type two, oh way back in the day (OK - 8ish years ago), I found it counter intuitive as an explanation for the fatigue - and the how and why of insulin resistance.
Why would our bodies shut down on insulin opening up the cells to glucose like that as a number one response, along with increased urination? And the fatigue. Because insulin resistance is indeed one of the first things that happens when we have too high levels of glucose in the blood, and I would argue - insulin in the blood to attempt to deal wiht the too high glucose. I had my first bouts with insulin resistance in my mid 20s, and along with my cells shutting out more glucose (and the insulin) my fertility also was on a go-slow, relatively speaking (PCOS - an insulin resistance based disease). If insulin resistance is alarm bells and a basic shut down, which I believe it is, reproducing is not on the cards either. At least - easy reproducing. I believe men have an initial reproduction go-slow thing going on too, in erectile dysfunction? It's a very big deal - insulin resistance. And our bodies are going all out to get such an important process as our blood glucose levels sorted asap.
A model/theory explaining the fatigue, gets to the heart of the cell - our mitochondira. And that it is that too much insulin and too much glucose is toxic for our cells, so that too much insulin and glucose needs to be shut out, or else, well - or else we die! So shut it out our body does. And it is not because there is not enough glucose in the cells - but that the cells are overflowing with the stuff! Filled to the brim, as it were, with glucose. Our blood awash with heaps of insulin responding to the signals going haywire. This model of insulin resistance - as a shut down to save our lives immediately, makes a lot more sense to me. But both these models are just that - models and theories of insulin resistance.
For you, with prediabetes, the fatigue is a very big warning sign. Sort your metabolism out now! (I imagine prediabetic bodies are saying

.) And don't get to the tipping point over into type two.
I didn't know any of this stuff when I was in my 20s, 30-40 years ago. (Neither did my doctors and specialists. There was no trickle down of this sort of information to the likes of me wiht insulin resistance off and on over the decades.) But you do! This is very good news.