I just switched from Atkins to SBD - that Prevention.com site is terrific! Go to the "message boards" and you'll see a board just for SBD. I think going from Atkins to SBD will be fine for me - they are quite similar. Atkins allows more fat - SBD encourages "good carbs". You will also want to keep an eye on the glycemic index of foods. Again, you can find a source on-line. I was disappointed to see the SBD book only in hard-back now. (I guess it's selling so well, they don't want to go paperback yet.) There is an official South Beach Diet website - but it costs! You don't need it - so much info is on the Prevention.com site. Good luck! I was successful on Atkins, but my son wanted to switch from WW to SBD, so I said I do this with him.