A Northland parent claimed teachers at her son's first school routinely rewarded children with chocolate and lollies, sparking debate about whether this is a good idea.

Health Ministry guidelines say schools should not serve sweets or chocolate at all, and concerns have been raised about the health impacts. 

Auckland University professor Boyd Swinburn says there could probably be better ways to reward kids for good behaviour.

"Plenty of schools have done it, plenty of schools do say they're providing the best environment for kids, they're being institutional role models - and they'll find ways to do it."

LISTEN ABOVE