Those are ideal numbers and definitely those that normal people get. Check out the graph and presentation linked on my page, What is a normal blood sugar?.
When we are using insulin it is possible to get those kinds of numbers or close, but it requires finding the right insulin for you and being careful about carbs. I can usually get to 100 two hours after eating when I use Apidra, which works the best for me. NOT with Humalog which gives me highs and lows no matter how I titrate it. Novolog falls in the middle as it is slower for me.
I can’t get down to 83 because I have some kind of physiological problem where I get counterregulatory bursts of liver glucose when I get below 90 almost all the time, and it probably has something to do with the odd kind of diabetes I have. But I do try to get back into the 90s two hours after meals and usually do. With Apidra I can handle 30-40 grams okay though I try to eat lower carb meals most of the time as that much carb plus insulin puts weight on me.
Solid research shows that blood sugars that leave you at 140 mg/dl at 2 hours after eating are high enough to cause neuropathy and early retinopathy, which is why you want to have blood sugars lower than that.
Lots of evidence shows people developing retinopathy and neuropathy at that 180 mg/dl at 2 hours target of the ADA. They should be ashamed of themselves for recommending it. Yes, there is “less” retinopathy and neuropathy at that level than at very high levels, but still a LOT. When we know people can avoid both complications with blood sugars under 140 mg/dl, why are they still recommending the dangerous high level?