Insulin Resistance: How does Metformin help those with PCOS?

[pcosnews]

A good number of women with PCOS have weight issues (are overweight, have gained a large amount of weight in a short amount of time). For some reason, despite their diet and exercise program, they STILL gain weight and find it incredibly difficult to lose weight at all. This is caused by something called Insulin [...]

More... (http://pcosinfo.com/blog/insulin-resistance-how-does-metformin-help-those-with-pcos/)