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Nutrition is a science. The details of a nutrient’s chemistry or a cell’s biology can be overwhelming and confusing to some, but it needn’t be. When the science is explained step by step and the facts are connected one by one, the details become clear and understandable. That has been the goal since this book was first developed and as it has continued to be updated in this fifth edition: to reveal the fascination of science and share the excitement of nutrition with readers. We have learned from the hundreds of university teachers and nutrition professionals and more than a million students who have used previous editions of this book through the years that readers want to understand nutrition so that they can make healthy choices in their daily lives. With its focus on Australia and New Zealand, the text incorporates current nutrition recommendations and public health issues, and food culture relevant to those studying and working in nutrition in this region of the world. Because nutrition is an active science, staying current is paramount. To that end, this edition incorporates the latest in nutrition research. The connections between diet and disease have become more apparent – and our interest in making smart health choices has followed. More people are living longer and healthier lives. The science of nutrition has grown rapidly, with new research emerging daily. In this edition, as with previous editions, every chapter has been substantially revised to reflect the many changes that have occurred in the field of nutrition and in our daily lives over the years. We hope that this book serves you well. Understanding Nutrition presents the core information of an introductory nutrition course. The early chapters introduce the nutrients and their work in the body, and the later chapters apply that information to people’s lives – describing the role of foods and nutrients in energy balance and weight control, in physical activity, in the life cycle and in disease prevention, and food safety. At the beginning of each chapter are clearly stated learning objectives to outline the key concept areas to be covered. Each chapter also clearly flags for the reader practical applications of nutritional research and presents the most recent research in the topic area.