It's 3:00 a.m. You're craving a peanut butter and jelly sandwich — or maybe a grilled cheese. You open the bread bag and — ugh! — the bread is blue with mold along one edge. As you're trying to decide whether to throw the bread away, you wonder, what happens if you eat moldy bread?
You remember that penicillin is made from mold [source: NLM]. That makes eating moldy bread okay, right? Think again. Here's the skinny on what might happen if you eat that moldy bread.