Since metformin does not raise insulin, it does not cause obesity and therefore does not worsen diabetes. So metformin sounds pretty good. The problem is that metformin (and other biguanides) does not take away the root cause of the illness—that is, they do not rid the body of excess sugar. Remember, hyperinsulinemia causes type 2 diabetes. While these drugs target blood glucose, they do little to relieve the underlying hyperinsulinemia. They take care of the symptom but, since they do not eliminate the cause, insulin resistance continues to rise and diabetes is managed but not eliminated.
