Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good, but a little too bio-technical.

An interesting book if you're wanting to understand the theory behind Sears's Zone diet. Good if you're interested in the biochemistry behind it and so forth. It's not as technical as an academic journal article, but more technical than a general-interest book.If what you want is just practical advice for getting in the zone, I'd go with "A Week in the Zone: A Quick Course in the Healthiest Diet for You," followed by "Zone Meals in Seconds: 150 Fast and Delicious Recipes for Breakfast, Lunch, and Dinner."