The researchers added that cheese and yeast-based breads are also among the top contributors to the sodium content of sandwiches.
The study did not account for additional salt sprinkled on foods or salt from non-food sources like antacids. But Sebastian said these sources make up only a small percentage of sodium intake for most people.
Because overall calorie intake played a large role in how much sodium people took in, Sebastian said, “it’s very important to pay attention to portion sizes. It's also important to select more fresh foods that are low in sodium and fewer processed foods that are high in sodium.”
Guenther advises, “pack your own lunches, make your own sandwiches, so you have control of the ingredients and the portion sizes.”