Teenager Josh suffers from such severe joint pain that it stops him from sleeping.
But the 16-year-old from Peacehaven, East Sussex, doesn't have an illness – his issues are caused because of his 20stone 6lbs frame .
The unhappy schoolboy lives with mum, Tracey, dad, Charlie, little brother, Jacob, and the family dog Chewy.
He descibes himself as "obese" and admits that he regularly comfort eats and hides sugary snacks in his room because he is so miserable.
Josh is one of the teenagers tackling their weight problems on 5Star's It's Your Fault I'm Fat.
He said: "I'm angry at myself and disappointed in myself for getting to this size.
"I get bored easily and food makes me less bored. Sometimes it's just an urge to buy food.
"I just see money as beng something I use to buy food and then making me happy through food.
"I don't like my belly, or my man boobs, or my ams and I feel sad that no one will love me and I will never lose the weight.
"I get joint pain and back pain and it keeps me awake at night."
But Josh doesn't just blame himself for his weight issues.
His mum, Tracey, regularly makes easy to cook processed meals while his dad, Charlie, uses food as a way of telling his family how much he loves them.
The bus driver struggles to express his emotions a dn rarely hugs or cuddles his family.
Josh says: "It doesn't help with my dad showering food instead of a hug."
And mum agrees saying the family has become "disconnected".
Even Charlie says the family are all "living their own lives".
Josh is determined to take action – not just about his size but also about the issues within his own family.
He records an emotional video message for his parents.
Josh says: "Every time I look in the mirror I just see a massive blob of fat. There's hatred inside me towards myself.
"Dad, every time we go for a hug, it feels forced. Don't buy me sweets, give me a hug instead."
The teenager persuades his mum and dad to join him on a strict six-week diet and exercise plan.
Gone are the huge portions, processed meals and sneaky snacks and midight feasts.
No more fizzy drinks, chocolates and sweets.
These are being replaced with three meals a day and three snacks a day.
Sugar and fat are being replaced wth high protein and low carbohydrate meals and snacks.
Josh will have to reduce his calories consumption from a massive 4,500 every day to just 1,500.
And his dad will have to eat just 500 calories for two days a week in a bid to support his son.
That's before the trio have embarked on their gruelling exercise plan of two personal trainer sessions a week and increasing their daily levels of activity.
Unfortunately it doesn't start well.
All the unhealthy food is cleared out of the kitchen but Josh has a hidden stash in his room.
Mum Tracey is soon on the case and the hard work begins.
Josh even cooks a meal for the whole family on the first evening of their new diet.
However, the serioous health implications of Josh's size are laid bare during the family's first session with personal trainer, Luke.
Josh's size means he is at a increased risk of Type 2 diabetes, heart disease and liver disease.
It's a shocking wake up call for the family.
Despite some hurdles along the way, with Josh remaining resistant to the exercise and food regime, the family are starting to bond.
And a trip to an assault course shows just how far Josh has come as he manages to complete it while the family love the bonding time.
But after six weeks of the gruelling diet and exercise plan will Josh have achieved his dream of sheddding at least two stone?
- It's Your Fault I'm Fat is on 5Star tonight at 9pm.
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