A groundbreaking book that reveals why plant-based eating is not only harming human health, it is also harming the planet. The authors explain why a pasture-reared meat diet - the Sapiens diet - is more ethical and humane than a vegetarian or vegan diet. With qualifications in medicine, nutrition, geology and agriculture, the authors bring together a unique combination of expertise in health, diet, earth sciences and the impact of farming systems on the environment. This thought-provoking and topical book explains how we can prevent and reverse many chronic diseases by eating the diet that drove human evolution, a diet based on meat, animal fat and offal. The book also shows how crop farming is causing climate change, soil destruction, animal suffering and ecological disaster. Why Vegans Have Smaller Brains: And How Cows Reverse Climate Change bridges the gap between pasture and plate in an accessible and engaging way.