One popular component of dinners in the UK could be particularly unhealthy, Dr Lee advised.

“Some stock cubes contain 50 percent salt,” she said.

“87 to 99 percent of shop-bought gravy should have a red health alert warning!”

She added: “If everyone in the UK cut their salt intake by one gram per day, this would prevent 6,000 deaths due to strokes and heart attacks every year.

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