Body chemistry is the whole key. I've been on the Atkins diet for about three years now; my cholestrol is well within normal limits, and I'm able to keep the weight off that I lost (about 35 pounds). My blood type is O negative. Apparently, according to some things I've read, that makes a difference.
Frankly, I don't really miss pasta dishes, desserts, or bread, but I sure as hell miss my Guinness and the wonderful northwest IPA's.
Cheers and congratulations on your success with the South Beach diet, guys,