Dr. Oz: America's Hardest-Working Doctor

The one area where Oz won't take his own advice, says wife Lisa, is in getting enough R and R. Though he spends time with his kids on the weekends—wrestling, playing sports, learning to juggle—the rest of the time "Mehmet leaves the house before 6:00 and gets home after 10:00," she says. "He doesn't come home for dinner anymore, which is endlessly frustrating." (Oz often dines at a vegan restaurant or brings leftovers from home.)

But Lisa believes getting older will force Oz to make recharging a higher priority. She mentions a recent injury: playing basketball with his 15-year-old daughter, he tore his Achilles tendon. "That never would have happened at 40," Lisa says. "He's beginning to see that he's not invincible."

Which raises the question: By driving himself too hard, does Dr. Oz risk harming his own health while trying to restore the nation's? "I do worry about it," Lisa says. "But I think he'll figure it out. He's a pretty smart guy."

Margaret Guroff is a features editor for AARP The Magazine.