The Auckland City Mission says the number of people visiting its foodbank will increase when Fonterra puts up its dairy prices by the end of the month.
The dairy cooperative has announced a planned increase, saying people could be paying up to eight cents more for a litre of milk.
The Auckland City missioner, Diane Robertson, says there's an increase in the number of people seeking help every time a price rise affects food items.
She says there are 175,000 children living in beneficiary households, and families will already be struggling to meet their basic nutritional needs.
Ms Robertson says the cost of what's considered a basic diet for two adults and two children under 10 is more than $165 a week.
The Australian firm Goodman Fielder, which owns the Meadow Fresh and Tararua brands, has also said its goods will rise in price, from July 21st.