Society prescribes a certain approach to food and health, but this does need to be the only way. Alex McDonald proved that an unorthodox wellness approach is possible by running five consecutive marathons in just five days – all without eating anything. In this conversation with Daniel Weinberg, he shares how he pulled off this extraordinary feat through ketogenic diet combined with sheer dedication. He also dispels some common misconceptions surrounding cholesterol and heart disease, as well as the true impact of carbohydrates on blood sugar and insulin.