The woman in her mid-fifties had traveled to our clinic from far away. I was her last resort, she said, and began to tell the story: Two years ago, the family doctor found the then chubby woman to have high blood sugar levels and prescribed her metformin. The drug is established in the therapy of type 2 diabetes. It curbs the feeling of hunger and supports weight loss. The woman lost some weight, but her blood sugar remained high.