Food prices are rising at their fastest pace since August 2020, figures from data firm Kantar suggest, as supply chain disruption continues.
Grocery inflation rose to 2.1% in October – the highest rate since last year, when retailers were cutting promotions amid the Covid pandemic.
Last week, the Bank of England confounded market expectations by holding interest rates.
But with overall inflation heading for about 5%, a rate rise is expected soon.
Supply chains have been under pressure from factors including the pandemic and a shortage of lorry drivers.
Retail and hospitality groups warned MPs on Tuesday that gaps on shelves and inflationary pressures would continue for the months ahead.
Kantar said that the fastest rising food prices included savoury snacks, canned colas and crisps.
However, prices fell for products such as fresh bacon, vegetables and cat and dog treats.
“Grocery prices are rising and this month inflation hit its highest rate since August 2020, when retailers were still cutting promotions to maintain stock on the shelves,” said Fraser McKevitt, head of retail and consumer insight at Kantar.
“As prices increase in certain categories, we can expect shoppers to continue to visit several supermarkets and shop around to find the best deals.”
Official figures showed overall UK inflation dipped slightly in September, with the rate falling to 3.1% in the year to September, down from 3.2% in October.
However, Shore Capital research analyst Clive Black said that some people were “struggling to believe” the inflation numbers from the Office for National Statistics.
He said the figures were “increasingly treated not with scepticism but incredulity as prices from fuel, energy, food, and building materials rise, offset by what?”
Fuel and oil prices have risen rapidly as economies start to pick up after being battered by the coronavirus pandemic, and as the Opec oil producers’ cartel gradually increases output.
Shortages and bottlenecks in goods including building materials and computer chips have also pushed up prices.