Jason Shon Bennett changed his diet and cured himself of allergies, asthma and other illnesses.
He now works to help others get free of health problems by eating healthy food.
"If you eat yourself sick you can't drug yourself well. If you eat yourself sick, you have to eat yourself well," he said.
Bennett spoke at a meeting at the Plymouth Hotel in New Plymouth last night.
Many of the health problems people have are because of the modern lifestyle and are diet related problems, he said.
He was born two months premature and suffered from asthma, hayfever, allergies, digestion disorders and skin problems.
"I was on drugs every day. I got to 20 and was told by doctors it was incurable. Take the drugs. Bad luck son."
So in 1987, he started researching diet and lifestyle - the old fashioned way by looking up books at the library.
"By the time I was 25 I had cured everything."
That was more than 20 years ago and he hasn't been sick since.
He has written a book, Eat Less, Live Long, and has an online programme called Thelifeplan, that people sign up to for a year and he teaches them to eat well, get well and stay well.
His wife Tracey provides vegetarian recipes to help participants learn a new way of eating.
Bennett encourages people to eat fruit, vegetables, whole grains and legumes and cut out dairy and meat.
One of the things he promotes is fasting one day a week.
"Most people on the programme do that. You sip vegetable juice all day. It transforms your immune system and gives your liver a break."
Bennett has studied groups of people around the world who regularly live into their 100s, he said.
There are seven or eight different groups around the world and there are similarities in the way they live.
People who have studied the centenarians found their longevity had nothing to do with genetics and was all to do with diet and environment, he said.
- Taranaki Daily News
What's your expectation of former tropical cyclone Pam?Related story: Cyclone Pam hits New Zealand
Get Taranaki's frequent news and sport updates
Get your mid week news fix
Get your South Taranaki news online