Steve Easterbrook doesn’t seem like the sloganeering type. He’s cool, a rational technocrat rather than a fiery head coach. Yet Easterbrook has two slogans he regularly employs. The phrases—“Act first, talk later” and “Progress over perfection”—hint that beneath his reserved exterior he’s aiming for real change. ... In a year and a half at the helm he has begun paring costs and decided to move McDonald’s MCD -1.81% headquarters from the suburbs back to Chicago. More important, in the U.S. market he launched McDonald’s successful All Day Breakfast, removed high-fructose corn syrup from the company’s buns, ended the use of key antibiotics in the company’s chickens, and embarked on a 10-year plan to liberate the birds that lay its eggs from the cages in which they have long been confined. The latter two changes are potentially transformative not only for McDonald’s—where chickens and eggs now account for 50% of the items on the menu—but for the entire American food industry. ... The Golden Arches are touting purity and provenance rather than solely relying on product launches—Shamrock shakes! the McRib!—to generate buzz as the company did in the past. The new approach allows McDonald’s to tap into the nation’s health zeitgeist in a way that it never has before. ... McDonald’s isn’t waiting for the supply—it’s creating it. But the seemingly simple change to cage-free eggs involves complex and expensive logistics, as we’ll see, and there’s a long, long way to go: Right now only 13 million of the company’s 2 billion U.S. eggs are cage-free.