Chitoka works with a fitness trainer to try to lose some weight and walk for the first time in a long time.

Chitoka invites family and friends to witness her walk outside for the first time in years.

Chitoka finally makes it into a car and is on her way to Dr Procter.

Naomi's boyfriend is unsettled by her physical and emotional changes since having surgery.

Chitoka is on her way to Dr. Procter's for the surgery, and her family is right there to support her.

Naomi opens up to her friends about her recent breakup and the setbacks it caused in her weight loss progress.

At 685-lbs, Justin is the largest teenager in America. See some of the daily struggles he faces at his size, and what is driving him to lead a healthier life.

These individuals transform their bodies -- and their lives -- over an intense seven-year journey.

Love motivates 660-lb Donald to begin his weight-loss journey.

My 600-lb Life follows individuals coping with severe weight issues.

James comes from a long line of family obesity and at 706lbs, is determined not to die in the same hospital bed that his father and sister did.

Chuck is surprised to discover that surgery didn't take away his cravings. He's still getting meals from the drive-thru.

Zsalynn is scared going into surgery, but she puts on a brave face for her daughter Hannah. She confesses that she wishes her husband were there to support her.

Zsalynn fights -- and wins -- the battle over tortilla chips at a Mexican restaurant, but she later falls prey to another food craving.

Olivia is placed in the hospital for 48 hours to assess her preparedness for gastric bypass surgery.

Penny is transported from her home in Maryland to see Dr. Nowzaradan in a Texas hospital. Once she's there, he shares some grim facts about her weight and BMI.