Instruct: Classify a review as either positive or negative.
Query: Informative

After reading the reviews, I was hesitant about purchasing this book. The internet provides a vast amount of information on the subject. When I started reading it, I thought that the reviews were right in the sense that it was redundant information. Not so...the first 8 or so chapters shows you how wide spread this problem is and how subtle and diverse the symptoms can be. The second half explains the different treatments & nutritional requirements. I don't think you can read too much on this subject, and I would recommend this book.