Campaigners have been concerned about some Dairylea products

Fats are being cut by about one third and the salt content is being reduced by about 9%.

Dairylea products had been criticised by health campaigners who complained about Lunchables' high salt content.

Kraft said revamped Lunchables had no artificial colours, flavours, or trans fats, and 113% more fibre than before.

The firm said in a statement: "New recipe Dairylea Lunchables is one example of how Kraft Foods is working with consumers to help them make healthy choices more easily."

Consensus Action on Salt and Health (Cash) welcomed the move but said a chicken sandwich without cheese would contain about 0.64g salt, which it said is about a third of the salt content of the Ham 'n' Cheese Sub Lunchable.