I tried to switch for a few days, and gained back 3 lbs. I know it's not much, but I'm terrified of ruining what I've worked for so far. From what everyone tells me, when you go off Atkins, you're probably going to gain back about 5 lbs, no matter how strict your new diet is, simply because re-introducing carbs will make you retain water again. After that, it's up to you. I see success stories all the time from people on other plans, so whatever works for you-whatever you can live with permanently, is the best plan.