Glucophage/metformin is an insulin sensitizer. People with diabetes and PCOS have problems using insulin efficiently so the metformin helps make the body use insulin better.

Insulin makes fat, so it makes sense that a person with too much insulin will make too much fat. By taking metformin and thus reducing the amount of insulin in the blood, the person creates less fat and can lose weight.

If you don't have any insulin problems, then I really don't see how metformin can really help. Eating low carb is probably the best bet for you.