Mastering the Zone: The Next Step in Achieving SuperHealth and Permanent Fat Loss is a hardcover book written by Barry Sears. It is part of the Zone Series and was published by HarperCollins in 1996. The book has 384 pages and covers topics such as nutrition, healthy living, and weight loss. The book is illustrated and has a weight of 19.8 ounces. It is 9.2 inches in length, 6.1 inches in width, and 1.2 inches in height.