In this book I do not intend to argue, condemn or convince. I myself was very interested in finding scientific answers to many questions about vegetarianism and meat-eating. Who is a person historically - a predatory or herbivorous organism? Why does a huge elephant need only grass, but for a person a raw food diet is a lot of stress? How to explain the fact that red meat is really very harmful, and chicken is an excellent dietary product? Why do the healthiest diets—Mediterranean and Japanese—have such a high proportion and variety of plant foods? Or, for example, why does the population of India, consisting mainly of vegetarians, have poor health, while the Caucasian meat diet predisposes to longevity? But most importantly, in this book you will find practical tips for optimizing nutrition that will be useful to everyone, regardless of food preferences. And in this sense, “Vegans versus meat-eaters” will become a logical continuation of my other books, such as “Forget the word diet”, “Sassy calorie” and “100 myths about food and harm.” Candidate of Medical Sciences, head of the Scientific and Innovation Center of the Siberian company Wellness Yu. Yu. Gichev