"I was hunched over like an old lady -- at one point, I had to spend a couple of days in a wheelchair," she said. "After I was diagnosed, I went to the supermarket and came out with only a small basket of food. I cried, as I could find hardly anything I could eat. I wanted to start the shop so people can see there are options for them."
As well as filling a need, Mr Allen said having Cornucopia on site has helped reinvent Video Ezy during a difficult time for the DVD rental businesses.
Since he took over ownership of the store six years ago, Mr Allen has seen rentals and sales decline rapidly, thanks in part to streaming programmes such as Netflix and LightBox.
"The writing's been on the wall for DVDs for sometime -- they are a dying breed," Mr Allen said. "
"Things were pretty bad for a while with illegal downloading, but they've gotten worse with things like Netflix.
"In the last 12-18 months, half of the Video Ezy stores throughout New Zealand have closed down."
These says, as well selling the Cornucopia products, the Carterton Video Ezy acts as a New Zealand Post outlet, having moved into the old post office building on High St in 2011.
"That does keep us busy," Mr Allen said. "Times are hard for a lot of businesses -- we've found we've had to adapt and try new things, and not just stick to our knitting. "
Ms Apperley said Cornucopia's range of allergy-friendly products -- including breads, cheeses, pastas, lunchbox fillers, puddings, and even tomato sauces -- have been a talking point for customers.
"We get a lot of mums coming in, looking for bread for their kids' sandwiches. There is a lot more awareness of things like coeliac disease, and more people are getting diagnosed.
"So gluten-free food is definitely a growing industry."