Not South Beach, but Atkins. So essentially monitoring how much "white" foods I consumed and no I did not use it as an excuse to eat mounds of fat

Lost over 21kgs, felt great, slept better, my IBS disappeared. Did it just before I started TTC and fell pregnant pretty much straight away (probably a coincidence, but who knows!) Honestly since then whenever I have made an effort to reduce breads, pasta's, potatoes in my diet I have always felt much better and lost weight (why I don't follow it all the time is beyond me).

As for the PCOS side of thing, I think Rouge might be able to help you there.