What Signs Should You Look for When Mold Is Forming on Bread?

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Mold will almost always grow on bread after time, particularly in warm, moist areas.
Mold will almost always grow on bread after time, particularly in warm, moist areas. (Image: Thomas Northcut/Photodisc/Getty Images)

While it may seem gross to some people, mold is a natural organism found just about everywhere on Earth and one that is vital to the life cycle. Much of the time it is not harmful to humans. However, when mold grows on food, it can release mycotoxins that are poisonous to humans, and most moldy foods, particularly moldy breads, should be avoided. There are a few signs to look for if you suspect that bread may be moldy.

Appearance

This is one of the most important ways to identify bread that may be contaminated by mold. Many different types of mold can form on breads, each with a distinct appearance and color. However, it doesn't matter what form of mold has formed on bread: none of these molds are safe to eat. If the surface of bread is altered by small white spots, light green or yellow furry sections or even dark or blackened areas, it's best to throw the bread out rather than to risk getting sick.

Environment

Even if bread has not reached its expiration date and has no visible mold on its surface, mold can still penetrate beneath the visible areas of bread. This is true of any porous food. Thus, those who are concerned about whether or not bread may be contaminated by mold should consider the environment in which bread has been stored. If it is excessively humid or moist, the bread could start to grow mold well before it is technically expired. If bread has been stored in such an environment for days, it is best to discard it and to store future loaves in a cool, dry place.

Bread Type

Not all breads are as susceptible to mold growth as others. Generally, the more water content a bread has, the more quickly it will mold. This means that a bread like oat bran bread, which typically contains an average of 47% water, will mold in most instances more quickly than Navajo fry bread, which has a water concentration of only 26%. If a bread seems particularly moist, then use more caution with that loaf as opposed to bread that seems very dry or has been toasted.

To Smell or Not To Smell

Some people having trouble identifying mold on the surface of bread may be tempted to sniff the bread to see if it smells like it has gone bad. This, however, is never a good idea. Smelling potentially moldy foods can cause mold spores to be drawn into the respiratory system, which can cause respiratory problems or other complications, particularly in those with weakened immune systems. When in doubt it is better to carefully dispose of the bread rather than risking contact with mold and illness.

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