1. Fertilizer in Sandwiches

That "Eat Here" sandwich sign outside your local diner might as well say "Eat Fertilizer." The chemical fertilizer ammonium sulfate is added to some chain restaurant sandwich breads in order to feed yeast in the baking process. What's a little fertilizer in our food? (By the way, like many of these entries, you should Google the name of the sandwich maker you are patronizing and check out their ingredients list; in this case, "ammonium" may be right there in the fine print.)