Cars line up before dawn. The sun’s earliest rays shine off the vehicles—some in pristine condition, some so battered they’re held together with duct tape. It’s a scene that plays out six days a week in front of the San Antonio Food Bank, amid lower-income neighborhoods on the city’s West Side, as hundreds of Texans wait for bags of groceries to fill stomachs that would otherwise remain empty.The food bank’s clientele make up a significantly different demographic from the sorority members and student athletes whom clinical psychologist Carolyn Becker has spent a considerable portion of her career studying at Trinity University’s hilltop campus, in an affluent area just north of downtown San Antonio. Like much research on eating disorders, Becker’s work has involved populations that…