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Watch Shut-Ins: Britain's Fattest People Season 3 Episode 2 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

In Airdrie, 23-year-old AJ is on a mission to satisfy his bariatric surgeon Professor Kerrigan that he is changing his diet and lifestyle, while he and his mum Sharon unpick the past with a psychologist to try to discover why he has gained weight.