The most notable change is the bread. The chain's Italian bread is baked for longer, at a hotter temperature, 370 degrees, to give it a crispier crust. The company also upgraded the recipe to its multigrain bread, which is made with Amber soft grain and three types of seeds.

What is wrong with Subway bread?

A franchisee of the U.S. food chain was hoping for a tax break, but Ireland's highest court ruled it was ineligible because the bread has too much sugar.

What changes did Subway make?

The chain says the move is the biggest menu change in its history. The revamp includes new recipes for the chain's Italian and multigrain breads, as well as new sandwich toppings. The chain is also tweaking items already on the menu.