Hi, about metformin and insulin resistance; the previous post is 100% correct about there being type I and II diabetes. However, metformin is normally used in type II diabetes. Type I diabetes is an autoimmune disease where the cells that form the insulin are destroyed by your body. Type II is usally due to the cells in your body not being able to use insulin - but production is usually preserved. If you have type II diabetes, it does not mean you will get type I diabetes...it just means with time the cells that produce the insulin in your body may also decrease and therefore lead you to taking insulin injections.

PCOS is often assoicated with insulin resistance and therefore metformin is given to improve this. Diabetes is only diagnosed when you have high glucose levels in your bloody when measured randomally or 2 hours after eating - you may have some degree of insulin resistance without being diagnosed with diabetes. but insulin resistance is usually progressive, which may lead to substantial increase is glucose - leading to diabetes.

So just because you are on metformin, it doesnt mean you are diabetic. Also often PCOS and insulin resistance is often linked to increased weight; in which metformin when given can help to lose weight. So it could work that way.

Hope this helps!