What do you think when you see people who are extremely overweight? Are you judgmental, or do you empathize with them? Meet people who are battling obesity—and learn what it's like to walk in their shoes.

Renee, a mother of two, struggled with food all her life. By the time she was 24, she weighed 500 pounds. Despite her weight, Renee could still care for her two daughters—until a 2003 car crash left her badly injured.

For the next four years, Renee was bedbound—and her weight peaked at a dangerous 900 pounds. "I have to be helped with everything," she said. "I can brush my own teeth. Comb my hair. I have to have everything brought to me, though."

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From The Oprah Winfrey Show The 900-Pound Mom