Good morning, Pneuco, and welcome! Yes, I've heard of metformin being used off label for reasons other than diabetes. I don't know about
the accuracy of some claims but I know it helps with insulin resistance and it's an inexpensive drug.
As far as diet, you are correct about
carbs. Vegetables low in carbs are always best to eat, along with some protein.
You might be interested in the website BloodSugar 101 which has lots of info about
these things but also studies and research. Click on the link in my signature.
Glad you posted!