I suggest checking out the 4-Hour Body by Timothy Ferriss: http://www.amazon.com/The-4-Hour-Body-Incredible-Superhuman/...

The book describes efficient, sustainable ways achieve changes in your body, the premise being to make changes with the smallest amount of work possible. I put on 10 lbs of muscle in 2 months following its weight gain advice. My girlfriend tried the slow-carb diet and saw no effect, but I have heard that working for a few people. It's an interesting read nonetheless and will change your perspective on diet and exercise.