Upcoming episodes, programme details and where to watch over the next seven days. All times are UK time.
Lifelong secret eater Nikki is threatened by immobility as her weight climbs to 650-lbs. She has a gastric bypass and confronts the emotional causes for her eating. S4/Ep1
Weighing over 700 pounds at 26-years-old, the clock is ticking on Ashley's life. Ashamed of her body, surgery offers hope, but not without setbacks. S4/Ep2
At 700 pounds, Chad undergoes gastric bypass surgery. He quickly sheds pounds, but faces a medical crisis when he does not follow the doctor's orders. S4/Ep3
At 670 pounds, Ashley is desperate to save her life and her marriage to husband David. Can weight-loss surgery give her the chance for a family of her own? S5/Ep2
44-year old Erica binges on food when faced with adversity, and previous weight-loss surgery was unsuccessful. Can she get the support she needs to change her habits? S5/Ep3
Single mother-of five-Cynthia works as a special needs teacher, but that is becoming impossible at 610 pounds - now both her life and her family at risk. S5/Ep4
Self-described 'secret eater' Doug can hide his snacking but his obesity is stopping him from living a full life with his wife, Ashley, who is now demanding a change. S5/Ep5
Diana is a prisoner to her 620-lb body. Desperate to break free of her food addiction, she embarks on a weight loss journey in order to regain her life. S5/Ep6
Weighing 791-lbs, James is bedridden, unable to stand, and can barely move his legs. He may only have a few months to live. Can bypass surgery save his life? S5/Ep7