A new study has found takeaway stores and fast food advertising are targeting schools and disadvantaged areas.
Author, Auckland University Professor Boyd Swinburn told Newshub children are heavily influenced by their surroundings.
"The amount of advertising and junk food around schools and more deprived areas was greater, they have almost three times the number of takeaways and convenience stores and outlets," he said.
The study found on average, more than two takeaway shops and nine unhealthy food ads were within 500 metres of schools.
"Children have some disposable income, they're easily influenced, they can influence their parents and they're ripe for marketing," Dr Swinburn said.
Only 40 percent of schools had a food policy but most are not enforced.