Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Superficial compilation of secondary sources

This book provides a very superficial overview of vegan nutritional issues. It cites heavily to dated secondary sources (nutrition books, encyclopedias, and journal articles, such as John McDougall's "The McDougall Program" (1990), Neal Barnard's "Food for Life" (1993), and articles in journals from the 1970s and 80s). There are few, if any, citations to primary sources or studies to support the text. If you're new to veganism and looking for an introduction to vegan issues, you may want to read this. If you want anything more in-depth or scholarly, look elsewhere.