Extreme Weight Loss

Twins David and Rebecca are split up as they tackle a 90-day weight-loss challenge.

An adopted woman named Meredith tries to reach her goal weight of 155 pounds and gain the confidence to contact her birth mother; Meredith receives a visit from actress Nicole Eggert.

A 410-pound man named Ryan tries to lose more than half his bodyweight.

Chris helps a married couple named Jason and Rachel.

Chris helps Jami lose weight by measuring her own fitness accomplishments.

Chris helps music producer and DJ Mehrbod break the cycle.

Trina, a 46-year-old nurse, initially embraces a new healthy lifestyle.

Chris helps Chantell, a stylish 25-year-old from Chicago, lose weight.

Chris travels to Kalamazoo, Michigan, to train Alyssa.

Chris helps family man Mike turn his health around.

Chris helps a woman who blames obesity for her daughter's death get healthy

Chris helps Cassandra, a former athlete who turned to food for comfort.

A police officer weighing nearly 450 pounds is in danger of losing his job.