There's reservations about the Government's new school lunch scheme.

Associate Education Minister David Seymour has unveiled a programme he says will continue feeding kids already getting free school lunches.

But he says they'll save $107 million a year by serving simple items and having a Government bulk-order for food.

Haeata Community Campus Principal Peggy Burrows says it'll likely throw up challenges for kids unable to eat things like gluten, dairy and nuts.

"I just worry that if the Government is going to be buying the food, how much flexibility are we going to be having for the children?"

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