Newly drafted rules about advertising to children should apply to all under 18-year-olds, rather than under 16-year-olds, a leading food and nutrition policy expert says.
The Advertising Standards Authority plans to stop brands associated with junk food from showing logos on sponsored prizes, promotional give-away merchandise, and childrens' sports teams uniforms as part of its new children's code.
But the code is industry-run and voluntary.
Junk food logos on kids' sport uniforms may soon disappear
University of Auckland researcher Fiona Sing told RNZ the criteria should be under-18s - to match the United Nations' definition of a child.
"Teenage children do need to be protected just as much as younger children because they are - they have proven to be - vulnerable, their cognitive abilities have been shown to be still developing," she said.
"Studies that show that up to 18 is an important time to still be protecting [children] from exposure from harmful marketing. And also, obviously, purchasing power has increased. Clearly, there's purchasing power from a younger age too, but we move away from children who have pester power, and can try nag their parents, to actually money in their pockets and having the ability to have a direct impact.
"So the marketing can can be more effective because it actually drives sales directly, as opposed to having to go through the parent."
She was concerned companies opting in to the rules would not be held to account unless members of the public complained about possible breaches.
"The enforcement of it [the code] is left up to the public, it's left up to the parents who have far too much to do as it is. It shouldn't be the responsibility of parents to regulate the food and beverage industry, it should be the responsibility of the government."
She is among academics, many who are involved in Health Coalition Aotearoa, who say self-regulation of advertising through the Advertising Standards Authority is not appropriate.
"Mandatory regulation is not only more effective at reducing exposure of children to unhealthy marketing, commodity marketing - but self-regulatory models are outdated. And many countries now are looking at legislating this area."
In Sing's opinion it was "quite clear that industry have a conflict of interest and that they can't adequately regulate themselves" when their shareholders want to increase profit.
The draft rules would apply to brands producing products high in fat, salt or sugar, that don't meet the Australasian nutrient food standards.
The authority described them as 'occasional food and beverage products: "Those food and beverage products which are high in fat, salt or sugar and classified under the Food and Beverage Classification System (FBCS) as being intended for occasional consumption".
Health Coalition Aotearoa co-chairperson Lisa Te Morenga (Ngāpuhi, Ngāti Whātua), who is also a Massey University Māori health researcher, told RNZ earlier this week that the proposed new rules were "well overdue".
"Exposure to junk food marketing increases the liking for junk food and intake in children and this happens to a much stronger extent than in adults. So yes, definitely the Advertising Standards Authority should be doing this. However we don't think this work should be under the voluntary control of companies involved in marketing junk food to children."
She said: "These these sorts of authorities don't have the teeth we would like them to have."
And in her opinion: "If we had an authority that was under government control we would have much stronger policy and it would be much more effective."
But Advertising Standards Authority chief executive Hilary Souter told RNZ that advertisers were normally receptive to changing rules and judgements.
Draft advertising code wants to ban brands from kids' sports
"We have a 96 per cent compliance rate with our rulings so there's a pretty high level of engagement across the industry. My experience is that people are happy to have guidance on what responsible advertising looks like."
She said: "Once we get a complaint, the complaints board - which is a body of five public members, and four industry members - decide if there's a breach of the code and we ask the advertiser to remove the advertising [if the code is breached]."
Consultation on the new advertising rules ends next month.