What if cancer isn't a disease of damaged DNA but rather of defective metabolism as a result of mitochondrial dysfunction? What if that startling truth could show us a radical new path to optimal health? In this groundbreaking guide, New York Times bestselling author and leading natural health practitioner Joseph Mercola explains how nearly all disease is caused by damage and dysfunction in the mitochondria, thousands of which are at work in nearly every cell in your body, generating 90 percent of the energy you need to stay alive and well. When they become damaged in large numbers, it is impossible to stay healthy. Dr Mercola shows that you can take control of your health simply by giving your body the proper fuel through a ketogenic diet, which is low in carbohydrates and high in healthy fats, to optimise the biochemical pathways that suppress disease and support healing. The benefits can be astonishing, not only to treat or prevent serious illness, but to boost your brainpower, increase your energy, help you lose weight, and more. As you read this book, you'll learn in clear terms how your body works at a molecular level, what kind of fuel it's best designed to burn and how to start your ketogenic eating plan. Best of all, you can build a healthier body and brain starting right now.