At age 53, Lisa Rustin slipped on a Del Mar, California, sidewalk and fractured her arm. A bone-density scan, recommended by her gynecologist because of her family history of thinning bones, revealed osteoporosis. She threw away her high heels, quit downhill skiing, overhauled her diet to include more calcium-rich foods, and started walking with a backpack filled with books—weight-bearing exercise is an important way to strengthen your bones. Rustin also began taking calcium and vitamin D supplements and a bisphosphonate drug, the most commonly prescribed osteoporosis treatment.
She considers her fracture to be—well, something of a lucky break. “My mother had broken her hip in the past, when there was no treatment for her osteoporosis,” says Rustin, who is now 58. “After I broke my arm, she fractured her shoulder.…