Do you know any one who has tried it what were there results?
I went on The Zone a few years ago and lost 40 pounds. It's a good diet but you have to be extremely disciplined and plan your meals a few days ahead of time. And it's good idea to have all your veggies cut, protein weighed and portioned out, etc so you can eat without having to do much prep. When you are expected to eat all of that food, you have to plan it so you don't accidentally cheat.
It certainly cut cravings for sugar and stuff, and I still try to eat in "zone diet weight loss", but I have moved on to another diet for maintenance and sports performance.