It’s lunchtime, your stomach is growling and you’ve decided to make a sandwich. But as soon as you head to the pantry and open the bread bag, you see it: a whitish, greenish spot. Ugh — it’s mold.

You’re all ready to eat your sandwich when you notice the golden brown of your roll now has a…decidedly green tint. So you wonder: Is it safe to eat moldy bread—you’d cut off the bad stuff, of ...

The problem might be bigger than you think.