Doctor and biochemist Catherine Shanahan was once a top runner. After suffering repeated injuries, she decided to embark on her own quest for healing. She explored dietary practices from around the world that have been proven to help people live longer and healthier lives—such as the Mediterranean diet, the diet of the Okinawa islands, and other so-called Blue Zones. She identified four traditional eating habits that have reliably ensured strong, healthy, and intelligent children, as well as active, vital older adults, across generations. These four strategies form the basis of the diet that Dr. Shanahan refers to as the "Human Diet": fresh and fermented foods, sprouts, cooked meat on the bone, and organ meats. Foods are not all produced in the same way. Real food.