I have tried the ketogenic diet twice, and I have to say that it works. What I liked about it is that it did allow me to lose weight, and surprisingly I had lots of energy with it - had an easy time waking up, and could go on the entire day without feeling hungry. However, there are two major problems with this diet for me. First of all, you start smelling a bit odd, both the body and mouthsmell. Secondly, it is very hard to follow this diet, and many times so not because of your strength of will, but just because it is so damn hard to avoid carbs in modern foods.
All in all, I believe that this diet deserves it due consideration, and you can give it a try.