I would just like to add my two cents. It's hard for me to say this sometimes, but I think that FOR ME it's true, and I've spoken to others who agree. The reason I do South Beach (and honestly, I've done Atkins too which also works for me) is because the way the books (esp. atkins) discusses the nature of insulin reaction and sugar consumption.
I'm prettyconvinced that sugar can be a substance as addictive as other drugs, although it makes a lot of people uncomfortable to think about it that way. I too have gone through the weight loss over and over, just to find myself eating high refined-carb foods in incredible excess, not because I'm hungry, just because I WANT THEM so badly! That's CRAVING. And I CRAVE things I'm addicted to, like I did when I used to smoke. To quit smoking, I had to QUIT completely. One puff of one cigarette would be fine one night - and a week later I'd be back to smoking a whole pack. It's all chemical reaction that makes my body crave. so when i quit, i did it one day at a time until the substance was out of my body completely. Then I had to deal with the psychological obsession, which can be the hardest part, long-term. I had to remind myself every day and night for months that ONE PUFF would make me a smoker and that I was doing so much better without it - was it worth it to go back?
South Beach and Atkins rids your body of refined sugars for a couple weeks. If you do the first phase perfectly, you should get some relief from those crazy impulsive cravings. However, I'm pretty convinced that my body isn't stupid, and knows that if I put it BACK in, I'll have the same reaction I did beforehand.
So, I don't know if I'm thinking that the cure is to NEVER eat sugar again. But I know I can't do it today. Probably not tomorrow. Can I do that? Absolutely. and then the days start to add up and I'm losing weight and feeling good. I can eat some fruit, some whole grains, veggies, oils, cheese. It's when I start to think too long term that the mental obsession kicks in again. Or that "just one bite won't hurt". It will.
Again, this is just my experience, so I'm not saying that this is exactly what you should do. But hopefully this makes a little sense.
GG
