Hi Dave: Metformin has a weight-loss side effect in some, and this generally stabilizes the longer you are on it.
I had a lot of hunger issues around the time of diagnosis. I never felt full, i'd eat, 1/2 hr later feel so hungry again, that gnawing hunger feeling. It was embarrassing...and disturbing to me.
Since metformin helps your body better utilize the insulin you are still producing, you're not as hungry. When we have insulin resistance, we eat, but our body doesn't properly utilize the insulin, so our cells aren't getting "fed" properly. The brain sends out hunger signals, we eat more, produce more insulin that we don't properly utilize, still feel hungry, eat more, and so on...a vicious cycle. I believe that's why many of us T2s are so overweight.
Congrats on all the positive changes you're making! Keep up the good work...and enjoy that break from hunger.