'I want to really just see how quick I can run. I want to, by the time I've come to finish, realise and look back and think : 'I did everything I could.'He is eating chips and a sandwich roll when I arrive. Not exactly the fare you expect from the man-cum-sprinting machine who is officially the fastest Paralympics athlete of all time. "It is probably not good but when you're burning that much calories it is probably all right," Jason Smyth chuckles. "I'm actually on my off- season at the minute, so I can get away with whatever I like."
Unsurprisingly, perhaps, for a 26-year-old young man in cool runners and a trendy top, Jason is a big fan of hip hop and R&B music.
"I am always away, so I don't have the opportunity to attend shows," he says. "But I was able to see Rihanna and Jay Z at the closing ceremonies of the 2012 Paralympics though."
Smyth, lest we forget, was the sensation of those games in London. He didn't just win two Gold medals – winning both the T13 100 and 200m races – he broke the world record for the third time in four races at the Olympic Stadium last September. Jason breaks world records like a bull breaks china in a china shop.
Meeting him – this shy, cherub-faced sprint superhero who suffers from the degenerative visual impairment Stargardt disease – adds an extra dimension to his extraordinary story.
He is unassuming and charming. Well, he puts up with my nonsense masquerading as journalistic questions. Jason can, and has, run a breathtaking 100 metres in 10.22 seconds. In terms of miles per hour, he says, "that's probably in the 20s I would guess." Jason laughs shyly when I call him The Norn Ireland Flier.
I don't know what exact speed Jason went up the aisle ahead of his bride to the altar in America last Christmas but considering the adoring manner in which he talks about Elise Jordan I'd suggest it was fast.
I ask him to describe Elsie.
The fastest Paralympian in the world pauses. Then he is away on a breathless reverie. "She is fun to be around and I am lucky to have her.
"She is very organised. She is passionate about her own career choices and goals, but is supportive of my career and is willing to put my needs above her own."
What first attracted him to her?
"I was attracted to her initially because we just had fun together," he says. "It wasn't stressful or too much work. We just felt comfortable together so we were able to be ourselves and just have a good time."
They met in Utah – Elise is from there – in September 2010 and went on their first dates. "Our entire courtship was long distance," Jason recalls, "so we dated in Ireland, Utah and mostly Florida, where I was training."
Jason, who was raised in the Mormon faith like Elise, has three aunties and uncles living in Utah. His future wife knew one of the uncles, Stephen, because they went to the same Mormon church.
"That's initially how we made contact, because she had planned with her friend to come to Ireland. And my uncle had arranged that they could stay at our house for a few days," Jason explains, adding that prior to that he went out to visit his uncle in America who introduced Elise to him with the words: "Take Jason out, go do something with him. So then at least you'll be familiar with him when you're in Ireland.'
"Then it all just kicked off from there," he smiles.
After they married on December 29, in the Salt Lake Temple of The Church of Jesus Christ of Latter-day Saints, the newly-weds lived in Florida up until July when Jason came back to Ireland and started competing. Elsie, who was working at a college in Orlando, and Jason have been running up their air miles points between Florida and sunny Derry for the last two years. "I don't know where I live to be honest," he says with a laugh. "I am kind of everywhere and in between the States and home."
So, where will they end up?
"She'll tell me America and I'll tell her Ireland," he says. "So really it could be anywhere. I'm open to what she wants and she's open to what I want. It'll be where we feel is best for us and, I suppose, eventually a family."
Jason, who is the eldest of three sisters and a brother – Leeza, Justyn, Laurajayne and Jessica – says he isn't sure how many kids he would like to have himself.
"It is probably a question she thinks more about than me. But I mean at this point it is not really something that we're looking at. We'll just enjoy being married for a few years. We'll cross that bridge when we get to it."
I tell him I was going to make a bad Mormon joke and ask instead of how many kids he wanted with his wife – 'How many wives he wanted?'
He bursts out laughing.
"I don't honestly think any man could handle more than one wife."
Jason, who was born on July 4, 1987, in Derry, was diagnosed with my eye disease at the age of eight.
I ask him when he first realised he had a problem with his eyes.
"I didn't. It was my parents that realised. It slightly decreases so you don't notice it as much. I was that young that I wasn't aware. It was more my parents noticed that I didn't look at things straight, or I would have to get really close to things to see things. That's how it started and then obviously I went and got tests done and eventually was diagnosed with the eye disease."
How Jason ended up on the running track – and eventually became one of the world's most famous runners: Ireland's Oscar Pistorius minus the shooting scandal – is, he laughs, "a bit of luck".
He didn't start athletics until he was 16 years of age. A PE teacher at Limavady Grammar School suggested he get involved in running at a local club because he was so quick. "I kind of didn't want to but I didn't want to say no to her," Jason remembers. "So I just said: 'All right, if you come back to me with the information, I'll go.' I was kind of hoping she'd forgot about it. Then she came back and I went down to the athletics club and that night I met Stephen Maguire who coached me all the way up to last year."
What was he going to do with his life if he hadn't got into athletics?
"I don't know if any teenager really knows what they're doing with their life."
His mother Diane was a nurse before she had Jason and his four siblings. His father Lloyd is a partner in a kitchen business. He says there was no pressure to follow his father in his line of work.
"None at all. I honestly don't know if I ever could have because visually you need to be able to see things and I think there are a lot of things I can't do, and I wouldn't do if I can't give it 100 per cent.
"And if I can't give it 100 per cent, there is no point doing something that you wouldn't be able to."
His parents would have always pushed him, he says, to do things wholeheartedly. Jason explains that initially when he started doing athletics "it was only once or twice a week but there would be days I wouldn't want to go and my parents said: 'Stick at this or you don't do it at all.' They really encouraged me with the building blocks that I would be able to build on as I improved. But I think they initially ... not forced, but were strong in encouraging me to keep me positive.
"I very much believe I have been blessed with a talent. Again, everybody has their own gifts in everything and in the many different aspects of life. Mine is running. There are plenty of people more gifted than me," he says.
He adds that of all his immense sporting achievements, what makes him most proud was defending "my title as Paralympic champion by retaining my Gold medals in London 2012. I put in a lot of hard work to not only win initially in Beijing, but to go back four years later and prove that I was capable of retaining my titles."
The partially sighted Jason became the first Paralympic athlete ever to race at the able-bodied European Championships in 2010. In a BBC documentary on him last year, Jason said: "I think things have to be a disadvantage. I mean if you lose 90 per cent of your vision it's impossible for it to be anything but a disadvantage, but for me it's normal and I suppose that's just the way it is. I've learnt to get on with it."
Jason realised because of his eye disease there were, he says, many things he was not going to be able to do in his life.
I ask for examples of the things he can't do.
"You can't drive," he says. "I mean, that takes away so much independence. If I travel anywhere I need somebody with me because I can't see things well enough. I get away with things if I've been there, because I can remember.
"Also, you look at lines of work. There are so many jobs that I could not do properly because I just can't see well enough . Or I don't have that independence to get around. There are a lot of things you can't do."
Was he ever depressed over it?
"No, no, no. I never was one of those people."
I ask him why wasn't he one of those people? He made a choice to be positive rather than negative?
"I think, yeah, it is a choice," Jason concurs. "I think the way my parents brought me up had a massive influence on me being positive. I didn't see myself as being anything different. I never look on it as 'I couldn't do this'.
"I know deep down there are things I couldn't do wholeheartedly but I never think of me being any different than anybody else. I always just went and did things. Those kinds of principles are from parents," he adds, "but without a doubt you make the choice to be happy or not. I think it can be a hard choice to make. If you are sad or depressed you don't often notice it but you make the choice in everything you do in life: 'If you make the most of it or if you don't.' And when you look at anybody with disabilities it is very easy to get caught on the wrong side of that line."
What is indisputable is that Jason hasn't allowed himself to become defined by disability.
"You obviously are somebody with a disability and that's how you are noticed," he says, "but do I feel myself any less off than you? No. You know, I am visually impaired but everybody has some kind of issue; if it is physical or if it is anything .
"Everyone has their own challenges to deal with in life and it is just about trying to be positive in everything you do. In my experience the things that are toughest are what make you or can make you a stronger person. You can overcome things and be a lot better than you can imagine."
Jason famously missed out on qualifying for last year's able-bodied London Olympics by a heart-breaking 0.04 seconds. Asked how he felt about being so close to competing in the Olympics but not quite making it, Jason smiles: "It was frustrating. I was disappointed. I had made a lot of sacrifices to try and achieve that and to come so, so, so close is worse than being nowhere near it."
How does Jason think he would have got on in the Olympics? His answer is certainly candid.
"To be honest, I wouldn't really have done much," he says. "I mean, if I'm kind of the guy that is just running around the standard time then I'm not going to be making the final. To be honest, to be making a semi-final you have to run in and around what your best is.
"If I had been able to run around what my best was that would have been a successful games; being able to achieve gold medals is fantastic but for me it is even better to just achieve what you are capable of, what your potential is."
"For me," he continues, "the reason I want to compete in the Olympics is because the standard is slightly higher and if you have something to aim towards then you are more likely to improve.
"That's the target of making the Olympics and it has not been done by a visually impaired athlete and to me that would have been nice."
In terms of retirement, God knows how many years – and miles of sporting track down the line – Jason says: "Obviously I plan to race in Rio 2016, and possibly go on to Tokyo 2020. How long I continue will depend on my performances each year."
His personality, he describes as "laid back, and down to earth. I try to always be hard working and honest. I feel secure in who I am and what I want to achieve. I like to have a good time and enjoy being around my family and friends."
He refers to his religion as a sublime source of strength for him. Jason's grandparents, he says, were one of the first members of the Mormon faith in Derry. "So I grew up a Mormon," he says. "It is a massive part of me and my life. One of the questions you were asking earlier about positivity. Well, I think it comes not only from my family but my faith has been a massive influence on who I am.
"It gives me a bigger perspective on life and what is important in life. For me, it's my wife, my family. They are the people that are always going to be there, you know, when this all ends. I believe I have been blessed with a talent and how great it is to achieve success – for me a measure of success is if I am able to do good with the talent I've got and inspire people and in some way bless or benefit somebody else's life to step up and be a bit more positive. I think that's what life is about – trying to do what you can to be better yourself and hopefully help others be better with you."
Jason Smyth, as the world knows, suffers from a degenerative visual impairment disease but his vision for the future is crystal-clear. He wants to break every record going and rewrite the record books.
"Obviously in Paralympic terms I want to keep going on and winning gold medals. Each year there is something. Europeans next year; World's the year after.
"But obviously the big thing is the Paralympic Games and to win again in Rio in 2016. I would like to make the Olympics in Rio in 2016," he adds excitedly.
"I want to really just see how quick I can run. I want to, by the time I've come to finish, realise and look back and think : 'I did everything I could to be the best I could.'"
Once he lays off the chips, he should be all right on that score.