Hello,
No I haven't tried The Zone, but I have heard of it. Wasn't it the one that Jennifer Anniston went on about 3 series into Friends and people commented on how much weight she lost? I steer clear of anything that smacks of Hollywood because it's usually very expensive (I once tried a diet that was mainly fruit and it cost me a fortune and the acid did some damage to my teeth). Also, things like this are fads and they come and go according to who is flavour of the month.
Yen