I did it and i LOVE it. You only keep the weight off if you change your life style- just like anything else.
But this diet helps you lose it in the right places and you feel relatively great while doing it.
My husband and I did the shots and both lost all that we wanted. It is now time to do it again (a year and a half later)
As far as re-setting your metabolism - you are not eating any dairy or gluten or sugar for the time you are on the diet. You gradually introduce those items, thus resetting your metabolism.
I lost belly fat, bad fat. Not the kind of fat you lose in when you are starving yourself.
The first 5 days of the diet are the hardest because you still have your cravings and habits. It isn't easy and you will be tired the first several days. Studies have shown that if you are changing your patterns you are wearing yourself out- just by making the change. The second week on is MUCH easier. Be prepared though for a hard first week. Some doctors will even give appetite suppressants for the first week.