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Good Housekeeping reports that food safety expert Darin Detwiler advises throwing away or composting an entire loaf when any mold is visible. Mold can send microscopic threads through soft bread, so cutting off the affected area does not reliably remove contamination; the report recommends keeping bread dry and freezing it for longer storage.
A Good Housekeeping food-safety report advises discarding an entire loaf of bread if any part shows mold, citing the risk that microscopic fungal threads may have spread beyond the visible patch. Food safety expert Darin Detwiler says cutting away the moldy area does not reliably remove contamination, a warning that applies to sliced loaves as well as whole bread.
The report says visible mold may appear as fuzzy green, gray or black patches, but what can be seen on the surface may not show how far the fungus has spread. Detwiler, a professor emeritus of food regulatory affairs, explains that mold sends out microscopic threads that can move through bread’s soft, porous structure. Those threads cannot be seen with the naked eye, so a clean-looking area is not proof that it is unaffected.
“If we see [mold], it’s like the tip-of-the-iceberg sort of thing,” Detwiler told Good Housekeeping. He also said cutting off a moldy spot “doesn’t actually guarantee that you’re removing contamination.” The report recommends putting the full loaf in the trash or compost rather than trying to salvage the slices around the affected area.
Good Housekeeping notes that some molds can produce mycotoxins, and describes possible effects from consuming or inhaling mold as including nausea, vomiting and breathing problems. It says the potential risk is a particular concern for people who are immunocompromised. The source does not establish that every moldy loaf contains mycotoxins or that exposure will cause illness; its practical guidance is to avoid the uncertainty by discarding the bread.
Why One Moldy Slice Affects the Loaf
The advice challenges a common approach: removing a visibly spoiled portion and eating the rest. With soft, porous bread, the visible patch may not mark the full extent of mold growth. Because the spread described by Detwiler is microscopic, inspecting nearby slices cannot reliably establish that they are clear.
For households, that means a single moldy slice can mean losing the remaining loaf, including bread that appears normal. The report frames this as a food-safety precaution, not a claim that every exposure leads to illness. People at higher risk from foodborne hazards, including those with weakened immune systems, have added reason to follow the conservative advice.
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How to Store Bread Longer
The report also gives storage guidance intended to reduce moisture, which can encourage mold. Detwiler recommends keeping bread as dry as possible and using a breadbox or paper bag, both of which allow air to circulate. The source does not provide a guaranteed storage period or say these methods prevent mold in every situation.
For longer storage, the report points to the freezer, particularly for bread intended for toasting. It advises against refrigerating bread because, according to the report, the refrigerator can make it stale faster than storage at room temperature. These suggestions are ways to preserve bread; they do not change the recommendation once mold is visible.
““If we see [mold], it’s like the tip-of-the-iceberg sort of thing.””
— Darin Detwiler, food safety expert and professor emeritus of food regulatory affairs, quoted by Good Housekeeping
What a Visible Patch Cannot Show
The report does not identify the mold species on any particular loaf, measure how far fungal threads may have spread in a given case, or say whether a specific loaf contains mycotoxins. It also does not quantify the likelihood or severity of illness after exposure. The guidance is precautionary: because hidden growth cannot be assessed by sight, the report recommends not eating bread after mold appears.
The source does not offer a separate method for assessing bread that has been stored beside a moldy loaf, nor does it give a precise shelf life for bread kept in a breadbox, paper bag or freezer. Those details depend on circumstances not specified in the report.
Discard the Loaf and Store the Rest
For a loaf with visible mold, the report’s immediate recommendation is to discard or compost the entire loaf, including slices that appear unaffected. Do not rely on trimming off the patch as a way to make the rest safe.
For future loaves, keep bread dry in a breadbox or paper bag, or freeze it if it will not be used soon. The report provides no new regulatory action or follow-up study; its advice is practical household guidance based on Detwiler’s explanation of mold growth in porous bread.
Key Questions
Can I cut off the moldy part and eat the rest of the bread?
No, according to the report’s guidance. Mold can send microscopic threads through soft bread, and trimming the visible patch does not guarantee that the rest is free of contamination.
Should I throw away a sliced loaf if only one slice has mold?
Yes. Good Housekeeping’s report says to discard the whole loaf, because mold threads may have spread to slices that look normal.
Can moldy bread make someone sick?
The report says mold can produce mycotoxins and lists nausea, vomiting and breathing problems among possible effects of consuming or inhaling mold. It does not say that every exposure causes illness, and it highlights particular concern for people who are immunocompromised.
What is the best way to keep bread from molding?
The report recommends keeping bread dry in a breadbox or paper bag, or freezing it for longer storage. It advises against the refrigerator because bread can become stale faster there than at room temperature.
Source: rss
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