When I'm shopping for whole grain bread, my eyes head to the fiber content first. I try to buy bread with four grams of fiber per serving, or at least more fiber than sugar. I recently read in Prevention that cereal and bread are among the top contributors to sodium in Americans' daily diets, so I will be training my eyes to check the sodium content as well. Eating over a teaspoon (2,300 mg) of salt a day increases your chance of developing hypertension, which leads to heart disease. So look for whole grain bread with 150 mg or less of sodium per serving to keep your levels in check.