The 85% Diet

Facing the physique-softening indignities of middle-age, a friend — call him Chumley, or Chum – adheres to a different diet-and-exercise plan every few weeks or months. He’s done them all, with varying degrees of success. (The old-fashioned “burn more calories than you consume” method doesn’t come with a glossy recipe book or 4-hours-a-month workout plan,...