Bread with a screw baked into it, soup containing maggots, a doughnut with green mould, a pie containing pig skin and miso soup containing glass were among 28 Rotorua-based food safety complaints made to the Ministry of Primary Industries (MPI) in the past three years.
There were nine complaints last year and four as of November this year.
Some cases were referred to local authorities or the product's manufacturer; others required the ministry to send an educational letter. Five complaints were deemed invalid.
Lakes district medical officer of health Dr Phil Shoemack said Toi Te Ora - Bay of Plenty's public health service - dealt with at least one outbreak of a potential food-borne illness a week. The illnesses were, however, often associated with events at home, or a school, hospital or rest home, rather than a food outlet, he said.
"In Rotorua, as everywhere else in the country, what people do in their own homes is a far bigger risk to food safety than the small but real risk of buying food from a commercial food premise," he said. "Store food correctly; make sure your fridge is working properly; don't leave things in [the fridge] for too long; and I can't over-emphasise the importance of having clean hands before you prepare food."