The average food bill could increase by £271 this year as prices continue to rise, further squeezing consumers.
Grocery prices were 5.9% higher in April than a year ago, the biggest increase since December 2011, according to research company Kantar.
It said shoppers were turning to discount retailers Aldi and Lidl as pressures on budgets grows.
Supply chain issues, the Ukraine war and rising raw material costs are all contributing to soaring food prices, the BBC said.
Fraser McKevitt, head of retail and consumer insight at Kantar, said: "The average household will now be exposed to a potential extra £271 per year.
"A lot of this is going on non-discretionary, everyday essentials which will prove difficult to cut back on as budgets are squeezed. We're seeing a clear flight to value as shoppers watch their pennies."
UK prices are rising at their fastest rate for 30 years, with increased energy, fuel and food costs all contributing.
Kantar said food prices were rising fastest in markets such as dog food, fresh lamb and savoury snacks, but were falling in spirits.
It said there was also evidence of some customers stocking up on certain products due to limited availability and increased prices linked to the war in Ukraine.
Last weekend some supermarkets introduced limits on how much cooking oil customers are able to buy, with supplies being hit by the war.