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.