"We need to protect and provide for New Zealand's future food supply," he told the Herald.
"If decision-makers don't have a clear view of the value of the Pukekohe food hub, we run the risk of an economic hit to Auckland of up to $1.1 billion in 25 years, with the loss of up to 4500 fulltime jobs, less fruit and vegetables available, and prices up to 58 per cent higher," he said.
During that time Auckland will also be hungrier, with population set to rise to 2.3 million.
Good growing areas also face problems of "reverse sensitivity" where local residents have to deal with problems such as tractor noise and the use of agricultural sprays.
The deputy mayor of Auckland and Franklin ward representative Bill Cashmore said under Auckland's unitary plan the "elite" soils around Pukekohe are protected, aside from those properties with titles that allow them to develop.
"By and large the productive soils around Pukekohe on the Auckland Council side — are protected under the Unitary Plan but not so much on the North Waikato side — there needs to be some work done," he said.
"But a national food strategy would be a very good idea."
"I think we need to look at the resources of the nation and what we can do to produce food — to minimise the environmental effects, maximise production and to minimise reverse sensitivity," he said.