The British Heart Foundation has warned that children consume almost five litres of cooking oil a year if they eat one packet of crisps a day.

The charity's warning is the second phase of its campaign aimed at highlighting the dangers of hidden salt, fat and sugar in foods.

However, Julian Hunt, communications director for the Food and Drink Federation, said: “We welcome anything that raises the debate about diet, but scare tactics are a waste of time. One of the great things about our industry is that we strive to give consumers genuine choice, whether it is a better for you version or a completely reformulated standard product.”