While Amy reaps the benefits of weight-loss surgery, her sister Tammy worries that she gained weight during quarantine; a visit to urgent care gives Amy life-changing news; Tammy's family confronts her over her health

Tammy struggles to get back on the weight-loss wagon in order get approved for surgery, but this time, her brother, Chris, joins her on the journey. Amy must deal with one very big life-altering repercussion of having had her surgery

Tammy and Amy blame each other for their issues in therapy; when Tammy gets devastating news from Dr. Procter, her brother, Chris, makes a life-altering decision; a very pregnant Amy can't stop overeating, and the results are disastrous.

Tammy's boyfriend, Jerry, comes to visit just in time to celebrate the sisters' favourite holiday: Halloween. Tammy's sister Misty questions Jerry's intentions. Amy has to face another weigh-in after her concerning appointment with Dr. Procter.

When Tammy and Amy go see a psychic, they both get disturbing news. The family rallies together, and they are willing to try anything to help Tammy lose weight. Amy must face her worst fears when she's rushed to the ER.

Amy gets unsettling news about the birth of her baby as her high-risk pregnancy has last-minute complications; with their next weigh-in ahead of them, Chris and Tammy are cautiously optimistic until Tammy steps on the scale.

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With her weight spiraling, Tammy makes a life-altering decision.

Tammy is back from rehab, and Amy makes a decision regarding her sister.

Amy is upset that Tammy's new nurse isn't pushing her enough; Tammy has started slacking, and the family worries about what could be the cause; Chris and Tammy clash when he confronts her about the new man in her life.

Amy must confront demons from her past, and Tammy admits to cheat days.

Chris comes down on Amy for enabling Tammy.

Tammy must see a new therapist, but things don't go the way she'd hoped; Amy wants to lose her excess skin, but she gets bad news at the plastic surgeon's office; Chris faces the scale; if he's below 400 pounds, his surgery is on.

Chris faces the ultimate weigh-in to get approved for bariatric surgery. With Tammy's weight at a standstill, Amy and Michael make a life-altering decision. The family's fears about Tammy's choice in partners are realized.

While Chris makes progress after his surgery, Tammy gets discouraging news. Amy plans a unique bash for Tammy's 35th birthday. The family excitedly plans their first vacation together with all five siblings, but concerns rise about Tammy's mobility.

The family vacation starts off terribly when Tammy refuses to enter the cabin. Chris hopes he's lost enough weight to fulfill a life-long dream. A last attempt to save the vacation ends in another confrontation. The siblings discover Tammy's secret.

After a rift on the family vacation, Amy returns home and drops a bomb on Tammy. While Amy focuses on her new life, Tammy makes a decision that takes her even further away from her weight-loss goals.

Amy and Michael finally move out of the duplex, while Tammy's partying phase takes a turn for the worse. Amanda tries to get through to her sister before it's too late, and Amy's in for a rude awakening at her annual check up with Dr. Procter.

Amy sees a paediatric dietitian and faces some difficult truths about Gage's diet. Dr. Smith makes a house call and confronts Tammy about her partying lifestyle. While on the road with Chris, Tammy's health hits a dangerous low point.

As Tammy heads home after 14 months in rehab, she's forced to make the most difficult decision of her life. Fed up with not having help, Amy feels her marriage is starting to unravel. Amanda and Misty reveal they're getting bariatric surgery.

Tammy hosts a housewarming party and has a few choice words for her mom; Amy's world is turned upside down when she finally confronts Michael over his lack of help with raising their two boys; meanwhile, Caleb hasn't been honest with Tammy.

After the blowout with Michael, Amy makes the hardest decision of her life; Chris and Tammy have a long-overdue appointment with Dr. Smith; worried about surgery, Amanda and Misty do a last-minute cleanse to sweat out nicotine.

Amanda and Misty get big news and take a major step in their health journey; Amy and Tammy blow off some steam; Amy gets some devastating news from her lawyer that sends her reeling.

Amy faces Michael in court at their first divorce hearing. Chris finds an unusual way to get healthy food. Tammy explores the possibility of having kids. Later, Tammy heads to rehab for a recon mission after learning some information about Caleb.

Caleb surprises Tammy with a romantic dinner date, but it goes south when Tammy learns what's on the menu. The Slatons attend a Zumba class together, but Amy's lack of self-care leads to a meltdown that has the whole family feeling déjà vu.