I have never been on a diet except the Slim Fast diet back in 1992 -
DH and I were intrigued about South Beach (Atkins was never considered - we don't believe in eliminating any food group) - we figured it was only for 2 weeks.
The first day was easy, but the second, third and fourth day were very difficult. I am a rice/noodle queen and I was tempted everywhere. I was also unable to work out with the intensity I was used to. My running really suffered.
I wasn't hungry because you can eat as much of the approved foods as you want. (But, how many chicken breasts can you honestly eat?)
Because DH has such incredible willpower (he picked out all the tortilla strips in his salad), we finished the 2 weeks with just one day of cheating. By the end of the 2 weeks, I no longer craved pastries, bread, and sweets.
The result was a 3 lb loss for me and an 8 lb loss for him.
But, the weight DID creep back once we started eating carbs again (and, we went on vacation).
However, we realized that a lot of the processed carbs we had been eating were "empty" calories - the stuff just makes you full and adds a lot of calories. (A large hamburger bun has almost 300 calories. 1/2 cup of cooked pasta has 200(?) and I don't know about you, but I can eat a WHOLE LOT more than 1/2 cup.)
Doing the South Beach diet made us more conscious of what we were eating, and also to realize that you really CAN cut down on processed/refine carbs.
I would definitely recommend the SB diet for people (like me) who think they just cannot live without carbs, and this diet is definitely maintainable long-term.