I have PCOS and have lost 12lbs since Christmas on a low carb diet. I wasn't massively overweight - my BMI was about 27.5 and I am a short arse with big boobs.
I eat mainly full fat dairy, eggs, meat, fish, green veg, salad. I avoid the more carby veg like carrots and potatoes. I eat way more veg than previously - it easily makes up 2/3 of my dinner and lunch, for eg.
No fruit (apart from berries occasionally), no white carbs like pasta or rice, not even couscous or bulgar wheat. I eat lentils, sushi, my mum's irish wheaten bread (which is mainly flaxseed and oats) about once a week/once a fortnight. If I am going to cheat, I try to make sure it's either delicious and amazing and a one-off or a healthy low gi sort of carb.
For a treat, I have berries, 4-6 squares dark chocolate. I haven't given up booze but am trying unsucessfully to reduce my consumption.
Come over to the low carber thread. It has really really helped me stay on the straight and narrow and to get lots of ideas for recipes.
I am TTC No1 and since losing the weight and going to acupunture once a fortnight, my periods are almost regular - I've had two in a row which were around 35 days! A miracle that hasn't occurred in about 4 years.