Not all sliced bread. The bakery at my grocery store offers all of their breads in sliced and non-sliced forms. I'm sure they put in some type of preservative,

Not all sliced bread. The bakery at my grocery store offers all of their breads in sliced and non-sliced forms. I'm sure they put in some type of preservative, as it lasts longer than when I bake bread, but it lasts no where near as long as the sandwich bread that is sold in a different section of the store.