“Understanding Nutrition” by Ellie Whitney and Sharon Rolfes is a comprehensive textbook published by Cengage Learning in 2018. The book covers the subject area of health and fitness, specifically focusing on nutrition and diet. With 848 pages, it provides detailed information on various aspects of nutrition, making it a valuable resource for students and individuals looking to enhance their understanding of this important topic. The revised edition offers updated content and insights, making it a reliable choice for those interested in the field of nutrition.