Teresa Williams Age: 27 Occupation: Medical assistant Starting Weight: 310 lbs. Why She Wanted to Lose the Pounds: "I was sick of being 25 years old, huffing and puffing," says Williams, who lives in Burbank, Calif. "[I couldn't] even go up a flight of stairs without stopping to breathe. I hated shopping – I was a size 24. I wanted to have kids, I wanted to have a family. I wanted to live."