She’s trapped in her own body. At 700 pounds, Colleen knows her addiction to food is killing her – and wants to change her fate. Here, Coleen tells her story, from childhood to the struggles she faces every day. Dr. Oz begins his intervention with a house call.

Click here to watch Part 2: Colleen admits why she's afraid to lose the weight.

Click here to watch Part 3: Colleens husband and mother join the show.

Click here to watch Part 4: After refusing medical tests for 15 years, Colleen begins treatment.

Click here to watch Part 5: Dr. Oz explains Colleens shocking test results

Click here to watch Part 6: Colleen's mentor, Ruby, promises to help her lose the weight.