Instruct: Classify the given Amazon review as either positive or negative.
Query: Effective but hard to follow

I tried this book about 1 month before my wedding because, of course, I had to look great! I must say that it really worked. I lost about 5 pounds in the 2 weeks that I followed it. I was only trying for 5 - 10 so I was happy. Thing is, I'm also an avid exerciser and I found this diet didn't give me enough energy to do my usual workouts. As well, there's a lot of preparation involved and figuring out what you can eat when, etc. For the purposes I used it, it was great but it's definately not something I could follow for a long time.