Dr. Nowzaradan tells Tara that if she doesn't change her eating habits immediately, she'll only live five more years. Tara is reduced to tears when her mother delivers an ultimatum on top of that.

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

Moving to Texas wasn't easy for Christina, but she's kept a brave face. Daunted by getting into her temporary home, though, she breaks down into tears.

Christina is shocked to discover how little weight she's lost after surgery. Her family offers her some excuses, but she tells them it's simply not good enough and she has to work harder.

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.

Paula mentally prepares for gastric bypass surgery by drastically altering her look with bright green hair dye.

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.

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.

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

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

Olivia travels from Chicago to Texas to see Dr. Nowzaradan, but the 18-hour car trip is grueling for someone in her condition.

Post surgery Zsalynn enjoys the next step in her battle with obesity, but her victory is short lived with the arrival of her unsupportive husband.

Paula is motivated to work out with a personal trainer at her gym, but it's still going to take some time before Dr. Nowzaradan's diet advice really sinks in.

Chuck weighs almost 700lbs and it has hindered every aspect of his life. He's had to downsize his business and his wife feels like a single-parent, who is ready to leave him.

Christina's husband and mother are enabling her to eat 7,000 calories a day. She learns a tough lesson from Dr. Nowzaradan: When they put food in front of her, she must simply say no.

Christina is shocked to discover how little weight she's lost after surgery. Her family offers her some excuses, but she tells them it's simply not good enough and she has to work harder.

Lee and Rena describe what a trip to the grocery store is like for them.

Christina's husband and mother are enabling her to eat 7,000 calories a day. She learns a tough lesson from Dr. Nowzaradan: When they put food in front of her, she must simply say no.

Nikki is staying with some family in Houston while she recovers from her surgery. See this step in her My 600 lb Life journey.

Lee gets into an argument with Dr. Nowzaradan when he doesn't meet his weight loss goals.

Brittani's eating helped her cope with the abuse she suffered as a child.

Two weeks post-op, Angel is determined to attend her son's football game. She's spent most of her son's life confined to the house due to her weight. Now, she's ready to live.

Janine's struggle with food started at an early age.

The stress of June's toxic addiction to food is destroying her relationship with Sadi, her girlfriend and caretaker. She hopes her 'My 600-lb Life' journey can save their love.

Janine realizes she needs to make a drastic change as leaves her apartment by herself to get food.

Dottie details her struggle with weight loss.

Janine makes her way to the airport in an effort to go see Dr. Nowzaradan in Houston.

After gastric bypass surgery, Chad shed weight quickly. But he still faced a medical crisis when he didn't follow the doctor's orders, and it’s time he go where he hasn’t gone since he was a teen- the gym.

Alicia recognizes that her weight was a topic of concern, even from a young age.

Kirsten struggles to leave the house, realizing she is now too large to fit in the front seat of a car.

My 600-lb Life premieres Weds on TLC.