The book "Physiological economy in nutrition, with special reference to the minimum protein requirement of a healthy person: an experimental study" by Russell Henry Chittenden is the result of deep research in the field of nutrition and physiology. In this book, the author examines the question of the need for proteins to ensure optimal human health, focusing on experimental approaches to determine the minimum level of protein necessary for the proper functioning of the body. Chittenden conducted a series of studies that help establish optimal nutritional standards for human health and energy. He follows a scientific approach to analyzing the impact of various diets on the physical and mental performance of a person. This book has become a classic source of information for scientists, nutritionists, and anyone interested in a healthy lifestyle. It opens new horizons in understanding the impact of nutrition on our health and longevity.