The fourth edition builds upon this solid foundation with a number of exciting updates. Two breakthrough USDA guidelines - Dietary Guidelines for Americans 2005 and the MyPyramid Food Guidance System - are discussed and analyzed in-depth in the first half of the book. New MyPyramid logo boxes spotlight critical information as it pertains to chapter content in the basic nutrition chapters. Another new feature box - the Personal Perspective - supplements the teaching points in each chapter with firsthand accounts from a variety of people representing various life stages and professions on the ways that nutrition affects their daily lives. In addition, a new third author brings a fresh perspective and years of experience in clinical nursing and patient education to The Nursing Approach boxes. Rounding out the fourth edition's offerings are two new ancillary elements - virtual case studies and chapter-by-chapter PowerPoint presentations - to enhance teaching and learning both inside and outside the classroom.