T2D is not permanent, or insulin resistance from GH. In fact, insulin resistance is tied to the mechanism of how it works to lower bodyfat.
I would probably take berberine from the start anyway, one of the compounds suggested by proudvirgin. A glucose monitor is easy to use but of course mist don't want to bother with it. My training partner has a glucose monnitor and I always suggest to him to check his morning glucose for a while when off and then when on, just as a favor to me. No he insists on checking it 5 minutes after a shot because he claims glucose takes off like a rocket immediately if the gh is real. Been asking him for years, no, won't do it.
He even gave me these boxes of pristine Genotropin because his son said his glucose crashed so it must be insulin, lol, I was glad to take it off his hands.