According to a survey, an equivalent of five million households used credit cards, overdrafts or savings to buy food.
The consumer group 'Which?' that conducted a monthly insight tracker survey focused on spending and behaviour of 2,000 people for its poll.
Which? executive director Richard Lloyd described the findings as "simply shocking".
The figures come despite official statistics last week showing that personal insolvencies have dropped to their lowest levels in five years, the BBC reported.
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The research found that 55 per cent of those using credit to do weekly shopping planned to cut back on food in the coming months, with almost a third saying they had to borrow from friends or family in order to make ends meet.
The study also found that one quarter of people said that they were living comfortably on their incomes and that more than one third - 36 per cent - felt their finances were under pressure.
Lloyd said: "Our tracker shows that many households are stretched to their financial breaking point, with rising food prices one of the top worries for squeezed consumers.
"It's simply shocking that so many people need to use savings or credit to pay for essentials like food.