ON A TYPICAL morning, 67-year-old musi -cian and runner Nolan Shaheed wakes up, does 40 minutes of stretches, push-ups, situps, and free weights, drinks a glass of water, and practices the trumpet for two hours. Then he heads to the recording studio for a while before breaking for a 90-minute run. Only then, after an afternoon shower, does he cook and eat his only meal of the day—a piece of fruit, a bit of white meat, and some vegetables and grains, usually rice, broccoli, and carrots. He’s been doing this six days a week for 40 years, and he holds at least a dozen masters world records, from the 800 to the 5,000 meters.
Fasting, even for short periods of time, isn’t new, of course—Plato was known to abstain to…
