Ellis asked:

"So if metformin isn't sugar, then what IS metformin?
And how and why does it cause release of insulin?"


It apparently doesn't release insulin. It works as follows,

Metformin is used to regulate blood glucose (sugar) levels.
Metformin works in three ways: first, it reduces the amount of
glucose produced by your liver; second, it reduces the amount
of glucose absorbed from food through your stomach; and third,
it makes the insulin that your body produces work better to
reduce the amount of glucose already in your blood.

http://www.drugs.com/metformin.html

Geoff

[Thanks for sending us this. - Ellis]