Subway has become the first quick service food retailer to commit to updated salt reduction targets under the Responsibility Deal with the Government.
The new targets, announced earlier this month, set maximum amounts of salt across 11 food categories, updating earlier targets from 2012.
Organisations that sign up have until December 2017 to make the reductions.
Subway was among the eating-out brands to sign up to the earlier salt reduction pledge, along with include Wetherspoons, Costa, Greene King and Strada.
Changes under the new targets include, for example, reducing the maximum salt allowed in 100g of margarine from 1.63g to 1.38g.
The average amount of salt per 100g of mozzarella has been cut from 1.5g to 1.35g and for pastries it has dropped from 0.5g to 0.35g. The maximum allowed for pesto and other thick sauces has fallen from 5g to 3.75g.