Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It works, but it's difficult

I really do like this book and I believe in the diet and eating healthier. However, the first 2 weeks are not only difficult to follow, but expensive! Produce isn't what it used to be and that's pretty much where you spend your time at the grocery store. Also, you cannot drink caffeine for the first 2 weeks and I'm a BIG coffee drinker. Switching to decaf wasn't that bad at first, but around the 3rd day or so, I started to get some pretty bad caffeine headaches. They don't really warn you about that. And not drinking ANY alcohol for 2 weeks? How realistic is that?! I'm no alcoholic, but at the end of a stressful day, I like to have a nice glass of wine. However, I did lose 3 lbs and 2% body fat within the frist 3 days. So... keep up with it, it is difficult at times and you do get hungry, but if you want to slim down and not TOTALLY starve yourself, this is the way to do it!