Dan Buettner and I were off to a good start. He approved of coffee.

“It’s one of the biggest sources of antioxidants in the American diet,” he said with chipper confidence, folding up his black Brompton bike.

As we walked through Greenwich Village, looking for a decent shot of joe to fuel an afternoon of shopping and cooking and talking about the enigma of longevity, he pointed out that the men and women of Icaria, a Greek island in the middle of the Aegean Sea, regularly slurp down two or three muddy cups a day.

This came as delightful news to me. Icaria has a key role in Mr. Buettner’s latest book, “The Blue Zones Solution,” which takes a deep dive into five places around the world where people have a beguiling habit of forgetting to die. In Icaria they stand a decent chance of living to see 100. Without coffee, I don’t see much point in making it to 50.

The purpose of our rendezvous was to see whether the insights of a longevity specialist like Mr. Buettner could be applied to the life of a food-obsessed writer in New York, a man whose occupational hazards happen to include chicken wings, cheeseburgers, martinis and marathon tasting menus.