When I (Diagnosed type 2) went on metformin, I lost 30lbs in 3 months.

I also have been diagnosed with Hashimoto's (an auto-immune disease that basically causes your both to make antibodies that go have thyroid hormones) but my doc insists the levels are fine but will recheck often since my siblings are both on sythnroids and it's improved their lives/energy levels immensely.