The document compares the anatomy and nutrition of carnivores, herbivores, and humans. It finds that humans are anatomically more similar to herbivores, with teeth and digestive systems suited for plant-based diets. The document also discusses the health risks of meat consumption like heart disease and cancer. It argues a plant-based diet could help address world hunger and reduce environmental impact. Overall, the document makes the case that human physiology and ethics support a vegetarian lifestyle.