After fighting with Tammy, Amy has a much-needed date night with Michael.
Amy decides to have a real wedding ceremony because if she gets approved for surgery, she's afraid she may not survive; after the wedding, the sisters head to Atlanta hoping for a life-changing final weigh-in.
Amy undergoes gastric bypass surgery to change her life, but endangers herself by not sticking to the post-op diet. Tammy seeks support from her love interest, Jerry. Two months later, the sisters reveal the changes they've made.
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.
The Slatons head back to Atlanta to see Dr. Proctor. Amy is worried about dropping the news that she got pregnant so soon after surgery, against doctor's orders. Tammy returns knowing she's gained all the weight back.
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 must step on the scale again after not sticking to her diet.
Tammy's new doctor gives her what feels like an insurmountable weight goal, but it's not the only challenge she's facing. Amy and Michael drop a bomb that changes everything.
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.
Amy counts down the days until her delivery with an eccentric photo shoot, while the family worries that Jerry is derailing Tammy's diet. Tammy reveals her big secret to Jerry.
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.
Recovering from the coronavirus, Tammy now needs constant oxygen, and her weight spirals; Chris faces his final weigh-in; Amy makes a big decision about her future; with Tammy's romance heating up, the family takes matters into its own hands.
With her weight spiraling, Tammy makes a life-altering decision; Amy finally gets a taste of the life she's always wanted, but, unfortunately, it's short-lived; an emergency surgery has repercussions for Chris.
Tammy is back from rehab, and Amy kisses her freedom goodbye as she comes to a decision regarding her sister; with his bariatric surgery on the line, Chris tries to shed the weight he's gained but is shocked when he and Tammy step on the scale.
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.
When Amy tries to get her house in order, she must confront some demons from her past. Tammy admits to a few cheat days just before her first doctor's appointment since rehab. Chris steps on the scale that could change his life.
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.
Amy will be the Maid of Honor in Tammy's shortly upcoming wedding, but the family wonders if there's a reason behind the short deadlines.
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 decides to make 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.
The family preps for their very first beach vacation, and Tammy hits some major milestones. While everyone flies, Amy opts for a nine-hour car ride which leaves her and the boys cranky. Then, Chris gives Amy some tough love.
Amanda reels after leaving dinner. Chris crosses something off his bucket list, and a dolphin tour takes an unexpected detour. Tammy tries to have fun but misses Caleb. Fed up with her siblings critiquing her, Amy reaches her boiling point and explodes.
Amy is ashamed of her behavior in Florida and wants to make amends, but she worries Amanda won't accept her apology. When Tammy gets some devastating news, her whole world is turned upside down, and her family rallies behind her in support.
With bonus scenes -- A time for cheer is met with jeer as the entire family remains divided during Christmas. Amy celebrates her first Christmas as a single mom and decides to try on heels for the first time ever. Chris confesses the house for Tammy won't be ready in time, which leaves him with only one option.
The family watch back highlights from the show and respond to viewer comments.
Sisters Amy and Tammy must lose weight to qualify for bariatric surgery.