I recently lost 10kgs in a month on a low carb, high protein diet. I also take metformin three times a day. It is much harder to lose weight since I they found out I had PCOS. I had gained 20kg last year and never had a weight problem before, and couldn't work out why in my job (I mow lawns for a living) that I could gain so much weight.

Metformin was the key for me, combined with diet.