Hi
@jamesbrook23 - just noticing that this looks like your first post, so saying welcome and feel free to ask any specific questions you may have.
In a sense, the way you phrase it gives an interesting perspective. There is kind of an assumption (actually I can only say that I had this assumption) that there is a binary normal-diabetic thing, and that "people without diabetes" can regulate sugar whereas people with diabetes cannot.
The reality (once you start digging because you have this diagnosis) is much more complicated, and that absent anything pathologically wrong with your pancreas, you can have a period of even as long as twenty years, with blood glucose "in a safe range" but needing more and more insulin in order to achieve that same regulation. This is the classic pathway to T2DM, where your Pancreas, being responsible for all that insulin; eventually pulls a Scotty - "she cannae take it captain"..
The medical system then kicks in when your average HbA1c reaches a threshold, but actually, the preceding 20 years of increased insulin is just as problematic, and we would all be much better off if we could keep our insulin levels lower (insulin does much more than regulate sugar and isn't supposed to be elevated so often).
It's difficult not to start seeing the whole thing the other way around, and question whether everyone is simply consuming more sugars and starches (which quickly turn into sugars) than we are supposed to cope with, day after day. If we keep doing that, some of us will develop diabetes, but the problem is that the elevated insulin levels lead to all sorts of other health issues.
The good news, of course, is that anything you do to better control your blood glucose, will also help with reducing insulin.
The problem, is that there isn't really anything that backs up what you are describing as "safe" - it's normal for sure, but the levels of sugar we are typically consuming are many times higher than what had been described as "safe" only 50 years ago, and rates of diabetes and pre-diabetes (which really means elevated insulin levels) are continuing to increase.
To be clear - I think that the way you express it is totally the way that most people think about this - it's definitely the way I did... so I'm only reacting to, if you like, the way my own understanding has changed.