Hi Reader, During the first year of residency, I had 30-hour on-call shifts. I survived on popcorn, granola, protein bars, and caffeine. Back then, I assumed the constant brain fog, headaches, mood swings, and memory lapses were just part of the deal. But later I realized—I wasn’t just sleep-deprived. I was nutritionally starved. And so was my brain. Most people don’t realize this, but your brain burns more calories than any other organ. It’s metabolically demanding. And what you feed it—or...