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It's tempting to lop off the fuzzy patch, but the mold could have spread already.
"Once you're able to see mold on bread, it means there's quite a lot of mold," said Nelken, a food consultant in Woodland Hills, California. "It's indicative that there's mold on other slices, just not at the level you can see it. Why jeopardize your health on a slice of bread?"
Nelken likened mold to jellyfish. "Even though you scrape off the head of the jellyfish, the tentacles are still in the food product."
Eating moldy bread could cause an upset stomach. Although most molds are innocuous, it's probably not going to taste good, food experts said. The U.S. Department of Agriculture Food Safety and Inspection Service recommends discarding moldy bread and baked goods, because of their porous texture.