Caterers and manufacturers could be forced to label foods "high in salt" if reductions are not made voluntarily, the government announced on Monday.

Speaking after a summit with a number of major food companies, public health minister Melanie Johnson insisted that a commitment to reducing salt levels must be made by the companies before February next year, or tough new labelling could come into force.

Considerable reductions are needed for salt levels to reach the recommended adult daily intake of six grammes, the minister said.

In beefburgers, this totals an average fall of 40 per cent, while in bread and breakfast cereals a reduction of between 20 and 40 per cent is needed.

"Salt can be a hidden killer," said Johnson.

"Whereas people are generally aware of the risks of a high sugar or high fat diet, they're often unaware of the effect of high salt intake.

"High levels of salt in food can lead to serious health problems including heart disease - one of the country's biggest killers. But there's only so much consumers can do.

"What many people consider a health conscious diet is often high in salt. Three quarters of salt intake comes from processed foods, like ready meals, where there is little choice."

"If we don't see progress then action on food labelling could be the answer," she added.

"I want to see openness and honesty and healthier options, which in turn will open people's eyes to the risks of a high salt diet.

"The government is committed to promoting healthy eating, tackling obesity and combating the big killers - high blood pressure, stroke and heart disease - and action on salt reduction is key to that overall aim."