A proposed policy that would require primary schools to ban fizzy drinks and offer their students only healthy drinks has opened for public consultation.

If implemented, the policy would mean schools would only offer children water, milk and non-dairy milk alternatives.

Minister of Education Chris Hipkins said dental decay was now the most common disease reported among New Zealand children and rates of obesity among young ones had increased significantly between September 2020 and August 2021.

Sugar-sweetened beverages accounted for more than a quarter of New Zealand children's sugar intake, he said.

"We know that if kids eat and drink well, there are a myriad of benefits and good outcomes for learning.

"The Government wants to ask what people think about all primary schools offering only healthy drinks, these being water, milk and non-dairy milk alternatives, to their students."

Some schools had already put their own healthy drinks policies in place, including water-only policies that permitted only water and plain, low-fat milk.

The proposal was initially only for primary schools but the Government is considering a similar policy for secondary schools.

"Promoting healthy food and drink in schools is common practice in other OECD countries. Evidence also shows the earlier in a child's development that healthy habits can be encouraged, the better."

The consultation is being run by the Ministry of Education and closes on June 2.