The co-authors of new book, Thinner This Year, promote eating right and exercising for a long, happy life. The book discusses why fat is bad for our health and other health issues. What makes this book different from other diet books? Co-authors Jennifer Sacheck, Ph.D., and Chris Crowley don't tell readers to ignore entire food groups or promise a quick fix. They focus on changing how you eat to consume a reasonable amount of calories each day.