Everyday groceries such as some meat, yoghurts and vegetables have doubled in price compared to a year ago, new figures show.
Prime Minister Rishi Sunak has been urged, by Which? who carried out the study, to intervene on behalf of shoppers struggling to afford food thanks to ‘shockingly high’ inflation.
The figures come ahead of a food summit hosted by the government on Tuesday, where farmers, supermarket bosses and retailers will discuss supply chain and rampant food inflation issues.
Which? analysed April prices on more than 26,000 food and drink products at Aldi, Asda, Lidl, Morrisons, Ocado, Sainsbury’s, Tesco and Waitrose.
Essential food groups like meat, fish and vegetables have continued to rise month on month.
How the price of items in your shopping basket have changed
At Asda, Morliny Frankfurters (350g) rose from an average of £1.25 to £2.42 – a rise of 93.8% – on a year ago.
A pack of four brown onions at Morrisons went from 65p to £1.24, a 90.8% rise over 12 months.
Also at Morrisons, Lancashire Farm Natural Bio Yoghurt 1kg went up from £1.18 to £2.18 over the year, a rise of 85.3%.
Which? found Aberdoyle Dairies Natural Cottage Cheese 300g at Lidl had gone from an average of 67p in 2022 to £1.34 this year, a difference of 100.9%.
At Tesco, a 260g pack of own-brand salmon tails rose 51.4% from £3 to £4.54.
Other food categories where inflation continued to rise month on month included juice, chocolate, water, fish, chilled ready meals and cheese.
Supermarket own-label budget items were up 25% in April on 12 months ago, demonstrating how low-income shoppers are being hit hard by soaring inflation.
The Which? study found inflation in categories which previously saw the biggest price hikes – including milk, butters and spreads and bakery items – has eased slightly.
Overall inflation has also started to ease slightly, from 17.2% in March to 17.1% to the end of April, according to the tracker.
Branded goods, meanwhile, showed no change on March, staying at 13.8% higher than last April, while regular own-brand food and premium own-brand food inflation decreased slightly.
Which? called on the prime minister to challenge supermarket chiefs to act urgently to help consumers cope with “rampant” food price increases by ensuring that smaller convenience stores stocked a range of essential budget lines that support a healthy diet, especially in areas where they are most needed.
It has also called for supermarkets to commit to clearer unit pricing, especially on promotions and loyalty card offers, so that people can easily work out which products offer the best value.
It comes as Tesco has announced price cuts on 30 of its own brand products, with 15p off 500g and 1kg packs of own-brand pasta, 14p off its one litre vegetable oil and 15p off its one litre sunflower oil.
Other supermarkets dropped the price of some lines of bread and butter last week. Sainsbury’s and Tesco also recently cut the price of milk by at least 5p, followed by Aldi, Lidl and Asda.
Sue Davies, Which? head of food policy, said: “It’s very alarming to see products such as meat, cheese and vegetables that people rely on still rapidly soaring in price.
“As the prime minister gathers supermarket bosses today to discuss the problem of inflation, we urge him to ask supermarkets to commit to do much more, including stocking budget lines in convenience stores to ensure easy access to basic, affordable food ranges that support a healthy diet, particularly in areas where people are most in need.
“Supermarkets must also provide transparent pricing so people can easily work out which products offer the best value.”
Rebecca Tobi, senior business and investor engagement manager at The Food Foundation, said: “We know that the current food price crisis is causing a great many households to cut back on essentials.
“With levels of food poverty among children having doubled in the year to January 2023, government and businesses must act urgently to ensure that everyone can afford and access healthy essentials like fruit and vegetables.
“If not, we will be seeing the long-term health and economic consequences of the cost of living crisis playing out for years to come.”
Want a quick and expert briefing on the biggest news stories? Listen to our latest podcasts to find out What You Need To Know.