The CDC recently published a report on the top 10 foods that contain the highest levels of sodium. The results are discussed in this article from the AP.
Bread is now the number one contributor to sodium in our diets based on the level of sodium per serving and the number of servings eaten on an average day by people in the study.This is not surprising. Packaged bread from supermarkets contain too much salt. Further, artisan breads from specialty stores or farmer's markets may also contain high levels of sodium. This includes bagels as well. Interestingly, some brands of potato chips and other snack foods we commonly associate with high salt levels were lower on the list than bread products.
So, try reducing the amount of bread eaten during the day. For example, if you have a sandwich, take the top slice off and eat it "open-faced". Same thing if you are making a veggie burger or soy dog. Based on the recommendations of many nutritionists, doing so can help improve long term health and also reduce your caloric intake. Make an honest effort to read labels on breads before you buy.