A Scot who ballooned to 41 stone and has been trapped inside for six years was left devastated after being told to lose weight in a bid to survive gender reassignment surgery.
AJ, who lives in Airdrie, spends 19 hours on a mattress in the living room every day eating up to 5,000 calories alongside mum who showers them, cooks and even sleeps in the same room.
The morbidly obese 24-year-old, who who identifies as non-binary, is forced to sleep on a pile of pillows while using a special sleep mask because the excess weight compresses airways.
AJ desperately wants to lose weight in order to undergo the life-changing gender surgery but was told they might die if they went under the knife.
Even the most basic of tasks require help from Sharon, who helps with trips to the toilet - and admits to 'overfeeding' her child.
The biggest fear for mum Sharon is that AJ will stop breathing during the night, so she sleeps beside her child on another mattress.
AJ’s plight story is part of a powerful Channel 4 documentary Shut-Ins: Britain’s Fattest People Britain’s “shut-ins” - people so obese they rarely leave their home.
"My role at the moment is mother to a giant baby," admits Sharon. "It breaks your heart to see your child like this, it really does."
Isolated at home, AJ relies on two dogs for company because "animals don't judge", having faced cruel taunts from bullies at school and even children on the street.
At a staggering 41 stone, AJ is carrying four times recommended weight for someone their age and can eat up to 12 teacakes and drink six litres of cola a day.
"I know a lot of people would say you're a mother it's your fault. Hands up yeah totally agree with you, partly it is my fault," Sharon admitted.
Doctors are concerned AJ's eating habits could see them dead in as little as five years time.
"The doctors are saying AJ is not going to be here in five or 10 years time the way you're going on. That's really frightening," Sharon confessed.
AJ, who identifies as non-binary and uses "them" and "they" pronouns, has another strong reason for wanting to lose weight.
They dream of having a gender reassignment operation, but doctors warn they might die if they went under the knife.
"My body doesn't reflect who I am because I still have the female attire. What I want now is a mastectomy and a hysterectomy. I want to be me, just me," says AJ.
Tipping the scales at 41 stone, any surgery on AJ is considered too dangerous, so drastic changes in their lifestyle and diet are needed going under the knife.
A BMI of 30 is considered obese, which means AJ is off the scale at a staggering 95.
Before doctors will agree to surgery, AJ is told to see a psychologist to pinpoint where the years of overeating started.
Clinical psychologist Dr Laura Williams unpicked years of ingrained physical and psychological habits stemming from bullying.
It was around the age of 12, when AJ already weighed 12st, that they were targeted by bullies - with mum comforting with chocolate and 'cheat' microwave meals.
Sharon explained: 'Some of the lads at the time would think it was funny to kick the football against her head. Really, really cruel words.
'I know as a parent, we should have said, no we're not having the chocolate or crisps. But when your child is coming home so upset, a kiss and a cuddle will only go so far.'
AJ gained 67kg, the weight of a person, in less than a year, which started ringing alarm bells for bariatric surgeon Professor David Kerrigan.
He told Sharon that her 'controlling' behaviour meant a weight loss operation could be 'a waste of time' for AJ - causing the mother-of-two to rush from their appointment in floods of tears.
Giving her some home truths, he said: "That shopping and that food that allowed AJ to gain the weight of a whole person in less than a year, you contributed to.
"This operation could kill AJ if it went badly wrong. It's a small risk. If AJ was my child I'd be thinking do I want them to go through that risk when it could be a waste of time anyway because of things that I'm doing."
Professor Kerrigan later told the camera it was 'really interesting' to see how AJ had responded when someone was 'really direct' with the mum, adding: 'I think AJ is up for this. Mum.... I'm less sure of.'
The pair were told to make changes before even considering surgery as there is no quick-fix solution.
"The problem has been swept aside for so long you don't notice things. It's only when someone says take a step back you realise they're right," confessed Sharon.
The family decided to make big changes to their lifestyle replacing fry ups and fatty snacks with with vegetables and exercise.
Just 15 minutes of gentle walking is exhausting for AJ, but they refused to get a lift home when suggested by mum.
In the next episode, we discover whether AJ will undergo surgery as they realise they need to be more independent and change their lifestyle - but will it be enough?
*Shut-ins: Britain's Fattest People airs Mondays on Channel 4 at 10pm