Married Graham Waugh, 45, piled on the pounds when depression and anxiety trapped him indoors for more than a decade, pushing his weight to a crippling 52 stones.
He gorged on 12 takeaways and 21 family bags of peanut M&Ms a week, all washed down with a can of coke every half an hour - or more than 16 pints a DAY.
But determined Graham - who also used to smoke 80 cigarettes a day - turned his life around after his big brother suddenly died, giving him a new lease of life.
He shed a stone a month thanks to a rigorous gym routine, strict diet and two operations - thought to be one of Britain’s biggest weight losses.
The father-of-two from Stopsley, in Luton, Bedfordshire, is now drawing up a business plan for the UK’s first gym for overweight, obese and super obese people.
He said: “All I could concentrate was food. I felt like I had nothing else in my life.
“I would eat lunch and instantly think that was for dinner.
“I felt as if I was on death row - I know how these people feel - but now I got lucky and it worked out.
“It hasn’t been easy but I feel like a totally different man.
“I was expecting to be dead by now. I feel like I have cheated death without a doubt.”
Graham had always been larger than his peers and would get in trouble at school when he would try to make people laugh to avoid being bullied.
But his weight spiralled out of control when he suffered from heart palpitations aged 27 - weighing 27 stone - which caused him to panic and become a recluse.
He recalled: “I was scared. I kind of went into a hidey-hole and became a recluse for the best part of 15 years.