He considers his latest film (The Giver), co-starring Taylor Swift and Meryl Streep, a cautionary tale. “I think it’s an impulse for human beings to want to suffer less, and we’re kind of addicted to comfort at all costs—at least I am. And of course comfort has a price,” he says. “So the film is asking…what’s the true cost of our comfort, and what are we willing to pay?”

What is he too comfortable with? Sitting on a long white leather couch at a photo studio in New York, Mr. Bridges holds up a half-eaten almond croissant. “I love taste, and I love the immediate gratification of flavor and that satisfying swallow you feel all over,” he says. “But I look at my body and I should say, ‘Is that really the most healthy thing for me?'”…

But leaning back and eyeing the last of his croissant, he says that…