Climate change is being partly blamed for an increase in the cost of healthy food

An Otago University study has looked at the weekly cost of providing healthy food to a family of four.

Most large cities saw a jump in price over the last year.

Louise Mainvil - from the University's Human Nutrition Department - says wild weather has affected growing conditions, pushing up prices as a result.

She says prices in Auckland, Wellington and Dunedin increased by between four and 21 dollars a week over the last year.

Christchurch bucked the trend, with costs falling by three dollars.