Do You Have to Throw a Loaf of Bread Out if Only One Slice Is Moldy?

Opening a loaf of bread to find fuzzy mold speckled on one slice has happened to everyone. But what if, upon further examination, the rest of the loaf looks unscathed? Can you still make a sandwich with the remaining bread? This common kitchen question has many stumped. However, the consensus among food safety officials is this: Any evidence of mold on a slice of bread is enough to consider the entire loaf ruined. 

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Why Moldy Bread Isn’t Safe

The tell-tale signs of mold growth — fuzzy green, white, or black spots — make it obvious to stay away from a slice. However, just because you can’t see mold on the other slices doesn’t mean it isn’t there. Mold spores and roots spread quickly, especially in soft, porous foods like bread, to the point where mold may not be visible. However, this invisible growth can do just as much damage as the mold you can see. Nausea is the most common side effect of ingesting bread mold, but coughing, sneezing, vomiting, headache, diarrhea, and fever can also occur.

Bread Storage Matters

Temperature dramatically impacts how fast bread goes bad because most types of mold prefer warm, humid conditions. Store-bought bread is safe at room temperature for two to four days, but storing it in a cool, dry place such as a bread box or cabinet can decrease the risk of mold growth and increase its shelf life to around one week. The USDA suggests storing bread in the refrigerator to prolong its shelf life for seven to 14 days. However, this method impacts its texture, making it less tender, and some mold can still grow in cold temperatures. 

Aside from temperature, other factors impact mold growth, including airflow. Mold spores float through the air, so leaving bread in loosely sealed bags can increase the likelihood of spoiling. Instead, seal bread tightly in a nonporous bag or container. Opt for loaves that are not pre-sliced. Sliced bread is exposed to much more air, and mold is more likely to grow on the interior sides of the slices, not just the outer crust. Additionally, freshly baked bread typically grows mold faster than store-bought bread because it lacks preservatives, so eat it within a day or two.

Freeze Bread to Prolong Its Shelf Life

Bread can also be frozen indefinitely but retains its quality for around three months. To freeze bread, wrap it in two layers of plastic wrap, followed by a sealed freezer bag to preserve freshness and avoid freezer burn. Some breads freeze better than others, such as sourdough and breads that don’t contain many ingredients. Breads with eggs or dairy tend to lose quality when frozen. To use frozen bread, defrost it at room temperature, then heat it in the oven for a few minutes at 350 degrees Fahrenheit until it is warm and back to its original texture.

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