I did it about a yr ago, Lost about 25 lbs on it. Didn't gain any muscle though, like they say you will. I was about 205 when i started it and got to to 180. It works, but any diet works. The best thing about this program is the training is very intense and quick, so you are out of the gym fast. It costs u a lot of money though if u do it the way they want you to... 3 myoplex's a day, plus phosphagen and betagen as well. It works better if you are fat and never work out. i worked out a lot before and never put on any muscle on it. I stayed the same. Those adds where they have guys who put on 30 lbs of muscle are jokes. There is no way you can do it on this program. But it does work and you will get a 6 pack.