when I saw the thread title, I thought the dark sparkly vampire craze had finally hit the diet book trade. "The Twilight Diet"
no, I've not heard of it. But unless it's something you can live with for the rest of your life, my guess would be it's no different from any other 'diet'. There are so-called diets that are lifestyle changes. When you find the one you can stick with, it will work.
Although I don't follow the South Beach diet, I still follow the food guidelines. South Beach is more about making better food choices. (at least that's what I got from it)
People do the same with Atkins. Atkins is not for me. I cannot eat that plan for a week, much less a lifetime!