I haven't watched it yet because the sound has gone on the PC I'm using to type this. (Sound Card driver has disappeared and will not re-install)
The primary effect of taking metformin is that the release of glucose from the liver is lessened, resulting in lower blood sugars.
Metformin also works to lower blood sugar in two secondary ways: by increasing your sensitivity to insulin and decreasing the amount of glucose that is absorbed from the food you eat.
As I have recently discovered, insulin resistance can be measured.
Does anyone want to have their insulin resistance measured, stop taking Metformin for several days (weeks? How long would it take?) and have insulin resistance measured again?
If you're monitoring with something like a FreeStyle Libre, you'd probably spot a difference in insulin resistance very quickly.
I'm saying that because I've been having HbOT recently and every time I use the compression chamber my BG drops because the compression causes an improvement in insulin resistance (there's some Japanese research that has looked at this). As soon as I leave the chamber my BG returns to what it was before. I can see the drop in BG very clearly on the Libre monitor and the graphs I print off, sometimes quite dramatic and sometimes BG has gone as low as 3. There could be some inaccuracy in that number, or maybe because it was only for a short period, because I felt fine. So a change in insulin resistance because of not taking Metformin would probably be detected quite quickly.
Trouble being, keeping BG stable seems to be such a balancing act that I'm not sure I want to chance it.