Welcome to the D’Adamo Institute for the Advancement of Natural Therapies. Over 30 years ago, I wrote “One Man’s Food is Someone Else’s Poison” about my work correlating blood groups and nutrition. It was my first book—and the first book ever written about my research and the successful treatment of thousands of patients through what was then a revolutionary approach to healing. Today, the idea of blood groups and diet has traveled around the globe, and many thousands of people have improved their health by following a diet and lifestyle based on their type blood.