The objective of nutrition is simple: to supply our bodies with all the necessary nutrients on a regular basis, and in appropriate quantities, to promote optimal health and function. However, in practice, nutrition is far from that simple, and our understanding of it continues to evolve in conjunction with the most current nutrition research on what seems like a weekly basis. The Nutritionist, now in its third edition, offers a one-of-kind resource for nutrition, exercise, health, fitness, weight management, and disease prevention information. Presented in a unique question-and-answer format, it seeks to create an experience akin to spending hours with one of world's most renowned experts in nutrition, exercise, and health. It provides an essential overview of the human body and food to serve as a platform for covering a wide range of important nutrition topics, including carbohydrates, protein, fat, vitamins, minerals, hydration, and exercise. It also defines nutrition application to achieve better fitness, weight management, disease prevention, and wellness throughout the lifespan. This comprehensive guide presents a valuable resource for health professionals, dietitians, personal trainers, and anyone looking for a deeper understanding of nutrition, health, and fitness.