Understanding Nutrition by Elite Whitney & Sharon Rady Rolfes Condition: Like new, never used, no sign of reading. The bestselling UNDERSTANDING NUTRITION makes the science of nutrition meaningful and memorable. Updated with the latest available research and the new 2015 – 2020 Dietary Guidelines, the 15th Edition emphasizes active learning and prepares students for their future careers. Authors Whitney and Rolfes draw readers into the study of nutrition with a lively and approachable writing style–dispelling students’ existing misconceptions and empowering them to make better nutrition choices and enact lasting behavior change.