This is a book that has caused great repercussions in the United States, and it has profoundly changed the American way of life. The author takes the health status of China people at that time as the research object, and compares the unhealthy life in the United States. The author is keenly aware that there is a protein worship in American society. However, excessive intake of protein has caused obesity, osteoporosis and decreased resistance. In contrast, people in China at that time were mainly vegetarians, and they took on heavier work, but the incidence of heart disease and diabetes was relatively low. This book once led the American nutrition revolution. Americans who like fast food and juice are turning to vegetarian food and vegetables. Paradoxically, today's affluent China people have lost their traditional way of life, so today, this book is even more enlightening to us.