Writing at History News Network, historian Margaret Lowe (Looking Good: College Women and Body Image, 1875-1930) reminds us that white female college students a century ago saw weight gain as healthy:

Instead of anxiety, when they gained weight and wrote home about it, they expressed satisfaction and even delight.  To rebuff critics such as Dr. Edward Clarke, who argued that ‘a girl could study and learn but she could not do all this and retain uninjured health . . .’ they used detailed accounts of weight gain to signify their healthy adjustment to college life.”

(There’s more to her book, and a good review of it at H-Net.)