Since the age of four, Daniel Pennock, 26, has refused to eat anything but sausages and fries for his evening meal.
He claims to be physically sick when any other food, apart from bread, crisps, apples, bananas and sausage rolls, comes near him.
The unusual habit has seen him pile on the pounds and cost him relationships with former girlfriends who got fed-up because he has never eaten out.
Mr Pennock, a lifeguard who wants to become a personal trainer, is seeking professional help to tackle his limited diet so he can live a “normal” life.
Mr Pennock, who lives in Wakefield, said: “I don’t eat anything apart from junk and I’m fed up.
“I don’t think I have ever eaten a vegetable in my life. I do eat bananas and apples, but if anything else gets near my mouth it makes my physically sick.
“I have sausage and chips every day, and I have done for 22 years. I’ve tried eating other things, but I just can’t keep them down.
“But I want to get it sorted out, once and for all - not just for me, but for my family.”
Mr Pennock says he used to eat “normal” food when he was a baby and toddler.
But, aged four, he refused to eat anything other than sausages and chips for dinner.
His mum thought it was just a phase he would grow out of, and worried he would stop eating all together, continued to feed him sausage and chips.
He now has toast for breakfast, a crisp sandwich or sausage roll for lunch, and then three or four Lincolnshire sausages with oven chips and two slices of bread for dinner.
Even on Christmas Day he has sausages for dinner - but with roast potatoes instead of chips.
He buys his food in bulk from a butchers in Grimsby and Morrisons.
“I’ve racked my brain and asked my parents to work out how all this started, but it’s a mystery,” said Mr Pennock.
“I thought maybe I might have choked on something when I was young, but my mum says no.”
Mr Pennock has visited his GP and has been diagnosed with selective eating disorder - a type of eating disorder where the consumption of certain foods is limited.
His carb-heavy diet saw 5ft 7in Mr Pennock’s weight peak at 19 stone, before he started dieting a few years ago.
Thanks to gym work outs he is now a more healthy 16 stone 5lbs, but his progress is being hindered by his unhealthy diet.
My son is running around and playing football and I’m tired out,” he said. “I’ve got no energy.
“People say ‘you’re fussy or picky’ but I’ve tried to eat other things. I have tried chicken before, but I was actually sick before it got to my mouth.
“I have tried pinching my nose, but I feel sick just thinking about it.
“My ex-partner and I have spoken about it and she said ‘if you were normal and we could have gone out for meals and stuff it might have been different’.
“But I was coming home and she was having her food, and I was making mine - it wasn’t really like we were a family.”
Mr Pennock has found a specialist in London who offers treatment for his condition, but is currently saving up for the £300 a time sessions.