Metformin does not lower blood sugars or weight loss to any great extent and isn't intended to. It helps to reduce insulin resistance, appetite, and the production of glucose in the liver - but all to a limited extent. It will not work on its own. It must be taken in conjunction with a suitable diet - ie. reduced carbs. It is not a miracle drug nor a drug that allows you to eat what you like. It is not insulin. If a person takes metformin but does not reduce carbs, blood sugars will barely improve. Appetite may be reduced with Metformin, but weight loss won't improve without a suitable diet.