A century ago, August Krogh, a Danish physiologist who had just won the Nobel Prize, embarked on a U.S. lecture tour. Krogh studied the intricate network of blood vessels that nourish our muscles, but he was increasingly interested in diabetes—a condition that his wife, the physician Marie Krogh, not only treated but also suffered from. Marie asked her husband to stop in Toronto, where a surgeon and a medical student had experimented with “pancreatic extract,” which appeared to shift sugar from the bloodstream into muscles and other organs. Krogh returned to Denmark with permission to sell the stuff. He and some colleagues started Nordisk Insulinlaboratorium, and in the spring of 1923 they injected their first patients with an early miracle drug: insulin.
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