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Every week, the Revis family (foreground, Brandon Demery, behind him is Ron) faithfully trekked to the health club in the Wakefield Medical Center in Raleigh, North Carolina, a hospital complex, for two-hour exercise sessions. They enjoyed the workouts, but found them so time-consuming that they wound up eating more fast food than ever. Fearing its potential impact on their health, they ultimately gave up the club in favor of dining and exercising at home. (Supporting image from the project Hungry Planet: What the World Eats.)