I am a 23 year old female who exercises 3-5 times a week, cardio and weights.
One thing I've noticed from reading these reviews is that many, if not most, of the reviewers have only recently read the book and begun to apply the concepts. (with a high rate of success, not to doubt.) I am adding my experience because I have been attempting to follow this eating plan for 5+ years for the purpose of losing body fat.
I read THE ZONE when it was first published and went on the diet hard-core, because it made so much sense to me. I had previously had NO success trying to lose weight on the traditional low fat/protein - high carbohydrate diet illustrated by the ridiculous, industry driven "food guide pyramid." (Let's face it- do you think Nabisco would be very happy if the U.S. Surgeon General made an announcement that Wheat Thins really aren't good for you?)
I did lose weight when I began to follow The Zone eating plan strictly. I was absolutely thrilled. I must say, I was a bit obsessive. However, over the past five years, I have struggled with my weight fluctuating 15 lbs. I have a hard time with what Dr. Sears protests regarding two things, now that I've been familiar with applying the concepts in this book for so long:
1) Lack of hunger/ food cravings: Even when following The Zone to a *T*, I experience intense carbohydrate cravings and get hungry between meals, usually after 3 hours at most. It is not my so-called improved hormonal balance that Dr. Sears speaks of that keeps me on track, but my sheer willpower.
2) Permanent weight loss: I was 18 when I began The Zone. I am now 23. As stated earlier, my weight has fluctuated +-15 lbs. over the past five years. It must be noted that over this time, there has not been *one single thing* that I've put into my mouth that I've not considered the "Zone" repercussions of. The bottom line is, that if I slip a bit, I readily re-gain weight. This is easy to do, because The Zone is in essence a very calorie restricted diet. Although Dr. Sears says that no foods are "forbidden," the Zone sharply limits several foods that many people really like.
In sum, I am very happy for the many people who have recently gained considerable success following The Zone balanced eating plan. However, my caveat is that I have doubts regarding the ability of most people to follow it for the rest of their lives. I know I have, thus far. I never feel really fulfilled. I am not satisfied by the size of the fat blocks which the diet prescribes for my height/ body weight. If I follow the Zone very closely (and I've had a LOT of pracice) I'm very frequently half hungry and miss many specific foods.
Good luck to all. If you've had a similar experience, I'd be interested in hearing about it.