I'm on Yasmin. It's hard for me to say whether being on the pill has prevented me from losing weight, because I was on it when I started Atkins. My weight loss has been slow, with a 5 week stall, but I started losing again after reducing alcohol. I do wonder whether I'd be losing weight faster if I weren't on the pill at all, but that's not a viable option for me.

BTW, I'm very happy with Yasmin. I asked my doctor whether there was a BCP I could take continuously (skipping the 7 day sugar pill and going straight to the next pack), and he recommended Yasmin. I didn't gain any weight from switching over to Yasmin, and I've lost 10 lb. total while on it. As a result of taking the hormone continuously, I have not had a period in 6 months, yippee!!! No more bloating either. And perfectly safe according to my OB.