One day at work, around 11 a.m., I had grown so sleepy that I could barely move my fingers to click my mouse. Focusing on the task at hand was impossible. So, with a lot of effort, I stood up, walked to the office kitchen and poured myself a large black coffee. I drank the whole cup – and still I was exhausted. I checked my glucose levels: they had been on a steep downward slope since a big spike after a breakfast made of a salt-and-chocolate-chip cookie and a cappuccino
