The health secretary, Matt Hancock, has warned the government could take action on food as retailers tell people to stop panic buying over coronavirus.
Speaking on the Sophy Ridge programme on Sky News on Sunday, Mr Hancock said he was "confident" shops won't run out of food, but he added he couldn't guarantee it.
And he made it clear the government could "take further action" in such circumstances.
Asked if food supply might be at risk, the Health Secretary told Sophy Ridge: "No, one of the things we are confident about is that the food supply will continue.”
But pressed to guarantee this would not be the case, he said: "Well, we are confident about it.
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"What I can guarantee is we will work with the supermarkets to ensure that people get enough.
"I understand why people might be stocking up - but people have got to behave responsibly.
"Supermarkets are right to write the letter calling on people to be responsible and to consider the impact their stocking up might have on others.
"And of course, we stand ready to take further measures if that’s necessary.”
His comments come as the British Retail Consortium, which represents retailers, sent a joint letter to consumers urging everyone to work together to ensure there is enough food for the country.
Scores of shoppers have been panic-buying essentials, including toilet paper and tinned goods, as fears intensify over the spread of the virus.
Supermarket shelves have been emptied and long queues have formed in stores.
Retailers are currently working "round the clock" to help customers get the items they need, the BRC said.
The letter said: "We know that many of you are worried about the spread of coronavirus (Covid-19).
"We want to let you know that we are doing everything we can so that you and your families have the food and essentials you need.
The letter added: "But we need your help, too.
"We would ask everyone to be considerate in the way they shop.
"We understand your concerns, but buying more than is needed can sometimes mean that others will be left without.
"There is enough for everyone if we all work together.
"Together we can make sure we are looking out for family, friends, neighbours.
"Together we will care for those around us and those who are elderly, vulnerable or choosing to remain at home."
Shadow health secretary Jonathan Ashworth said people were not selfish for stockpiling essentials.
The Labour MP said: "People are worried and I think the broader issue and point is this: we really need a mass co-ordinated effort.
"Certainty is everything and people need advice and this virus spreads quickly and it exploits ambivalence and we don’t want any ambiguity."
