I don't know anything about HCG, but I lost about 10 pounds in 3-1/2 weeks and it was almost all fat by doing
The Rapid Fat Loss Diet.
Fat is all you really care about losing anyway, amirite?
Here's the book, I highly recommend it:
http://www.bodyrecomposition.com/the-rapid-fat-loss-handbook
You eat a lot of protein, but not many calories. I was eating around 1000 calories per day, 230 grams from protein, around 10-15 grams from fat and the rest from fibrous carbs that you can eat unlimited amounts of. I was stuffed. Protein fills you up and spares muscle loss.
He's also got more moderate plans that take longer and are better for developing a lifestyle long term, see
http://www.bodyrecomposition.com/a-guide-to-flexible-dieting
He's also got a forum where you can get a lot of info but be sure to use the search button before you ask questions or you'll be ignored or chewed out if the issue has already been addressed.
Forum:
http://forums.lylemcdonald.com/
You might also be interested in a site called
www.leangains.com, I'm going to try this as its more suited to my lifestyle
You'll learn a lot from both sites, especially how much BS exists in the world of dieting.
Both of these guys are no nonsense, scientifically based guys and not out to make a quick buck off a gimmick, quick fix scheme.
Let us know if you try it and how it works out and G/L!