"We are desperate to go ahead with it, so we are doing everything we can to get the word out there," she said.
Wheeler said the Taco Health programme would start and end with full-day sessions, offering practical hands-on learning about cooking, food labels, activity, stress management, sleep, mindfulness, and emotional health.
Participants would also receive base-line health testing, and would be offered recipes.
In between these in-person sessions, there would be weekly online sessions with the doctors, and group support via Facebook.
"Our aim is to help people to learn the skills to improve their health in the long term, in a way that will be sustainable for the future," Wheeler said.
Among the positive outcomes could be improved sleep, energy, immunity, and mood, weight loss, reduced blood pressure, and a better overall quality of life.
Williams and Wheeler believe programmes such as Taco Health could help to stem the tide of diabetes, which threatens to become a global health crisis.
A recent report from Diabetes New Zealand, entitled The Economic and Social Cost of Type 2 Diabetes, stated the number of people with the disease was predicted to reach "epidemic proportions" in the next 20 years.
There are about 228,000 New Zealanders (4.7 per cent of total population) living with type 2 diabetes, which was projected to increase to 390,000 to 430,000 (6.6 per cent to 7.4 per cent ) as the population aged, the report said.
The current annual cost of type 2 diabetes to New Zealand, estimated at $2.1 billion, was projected to increase to $3.5b.
This would have a "hugely detrimental impact on the wellbeing of our people, but also on the sustainability of our health system and economy", the report said.
Type 2 diabetes was linked to a range of health issues, including poor eye and limb health, heart attacks, strokes, and an increased risk of cancer.
Prevention was vital for both the health of the population and the economic health of the country, the report said.
• For more information on the Taco Health programme, visit www.tacohealth.org or email tacohealthdunedin@gmail.com.